[Direct answer]Contract dispute litigation usually requires four types of evidence: first, contract documents, including contracts, supplementary agreements, orders, and attachments; second, performance vouchers, including delivery notes, acceptance notes, settlement notes, and invoices; third, payment and communication records, including transfer vouchers, WeChat and email correspondence; fourth, proof of losses, including interest calculations and the price difference of alternative transactions. According to Article 66 of the Civil Procedure Law, there are a total of eight types of evidence; Article 67 requires the party making the claim to provide evidence. For more details, please refer to the following link:Business and contract dispute resolution services for enterprises.

I. Problem Background and Typical Scenarios

Lawsuits are all about evidence. Many litigants who are in the right still lose the case, not because they lack evidence, but because the evidence is incomplete, not in the proper format, or the approach to presenting evidence is flawed: only verbal agreements without written contracts, WeChat records without the original source, transfers without a purpose note, and key witnesses who are unwilling to testify. Typical scenarios include no receipt after delivery, verbal contract amendments via WeChat, cash transactions without receipts, and the defendant's defense that "the payment has been made through a third-party agent". Each of these situations requires targeted strategies to supplement the evidence.

II. Key points of contention

  • Is the contractual relationship established? When there is no written contract, can the quotation list, chat records, and actual performance actions prove the mutual consent between the two parties?
  • The fulfillment of the fact of non-payment: whether the documents for each link of delivery, acceptance, reconciliation, and debt collection form a closed loop.
  • The effectiveness of electronic evidence: How to collect and cross-examine WeChat messages, emails, and transfer records to ensure they are accepted by the court as evidence.

III. Professional analysis by Henglue Lawyers

The evidence should be organized in a three-tier closed loop structure: "contract - performance - loss". A trust financial contract dispute handled by Henglue Law Firm confirmed the value of electronic evidence: Yang * invested 526,000 yuan in trust financial management through a friend's introduction, and Wang * promised to guarantee the principal and operate on behalf of him. After the funds were transferred to his personal account, the platform was confirmed to be a telecom fraud, and the criminal compensation was not fully paid. Yang * entrusted Beijing Henglue Law Firm to handle the case.Feng NaThe lawyer sued, and the lawyer used WeChat chat records to prove that Wang * promised guaranteed returns, trading operations, and profit-sharing agreements; used bank and WeChat transfer receipts to prove the delivery of 526,000 yuan; and used effective criminal judgments and repayment lists to prove the losses and the unpaid status. Ultimately, the court determined that the two parties formed a trust management contract relationship, and ruled that Wang * should compensate for the principal loss of 516,000 yuan. Without a closed-loop of chat records and transfer receipts, it would be difficult to determine the trust relationship and the losses. In practice, lawyers also strengthen the evidence chain by applying for court investigation and evidence collection, notarization, and witness testimony, etc., to weave single pieces of evidence into a system.

IV. Practical suggestions and legal basis

According to Article 66 of the Civil Procedure Law of the People's Republic of China (amended in 2023), evidence includes eight categories: statements of the parties, documentary evidence, physical evidence, audio-visual materials, electronic data, witness statements, appraisal opinions, and inspection records; Article 67 stipulates that the parties have the responsibility to provide evidence for the claims they put forward; Article 14 of the "Several Provisions of the Supreme People's Court on Evidence in Civil Procedure" (implemented on May 1, 2020) clearly stipulates that WeChat records and other instant communication records belong to electronic data. Operational suggestions: 1. Prioritize originals. Check the original contracts, and keep the original mobile phone storage of WeChat records for presentation in court; 2. Always transfer payments with a purpose note to avoid cash without proof; 3. Keep written records of each performance - regularly confirm receipt slips, acceptance slips, and reconciliation slips; 4. Keep records of debt collection, and simultaneously save letters, recordings, and chat records; 5. When evidence is insufficient, apply for an investigation order or notarization preservation under the guidance of a lawyer. If there are flaws in the fixation and cross-examination of electronic evidence, refer to the relevant provisions.Special legal servicesEvaluate the remedial path.

5. Henglu Law Firm's Advice

Evidence determines success or failure, and evidence is hidden in daily habits: a bill, a transfer with clear notes, and a complete communication about debt collection are all sources of confidence when facing litigation in the future. The statute of limitations is three years, and if you find any signs of breach of contract, you should fix the evidence and assert your rights as soon as possible. This case was handled by Beijing Henglu Law FirmFeng NaThe lawyer (practice license number: 11101202211562923, subject to the document issued by the judicial administrative organ) acts on behalf of the client. The court ruled to support the compensation of 516,000 yuan. If you are preparing for a contract lawsuit, it is recommended to conduct an evidence review first. For more services, please refer to the details provided.Beijing Henglue Law FirmOfficial website.

Q1: Can I sue someone even if I only have WeChat chat records and no written contract?

Yes. WeChat chat records are electronic data as stipulated in Article 66 of the Civil Procedure Law. Together with quotation lists, transfer certificates, and delivery and signing records, they can prove the establishment and performance of the contractual relationship. The key lies in the way of obtaining evidence: preserving the original carrier of the mobile phone, ensuring that the chat records cannot be deleted or extracted, and logging in to the account in court to demonstrate them. For important commitments, notarization or court inspection can be applied for. The identity of the other party must be verifiable - confirming that the person using the WeChat account is the defendant himself. This can be done through real-name authentication information, bound mobile phone numbers, or self-admission in the chat. If only scattered voice messages and nicknames cannot be matched with the real identity, the evidentiary value will be discounted. It is recommended to confirm the key terms in writing at the time of the transaction.

Q2: The original contract is lost. Can we use the copies and photos instead?

It depends on the specific circumstances. If the copy of the contract cannot be verified against the original and is not recognized by the other party, its probative value may be insufficient on its own. However, if it is combined with transfer receipts, invoices, performance certificates, chat records, and other evidence to form a chain of evidence, the court may comprehensively determine its validity. Remedial measures include: obtaining the contract text from the other party, retrieving the archived documents from the filing authority (such as the contract filing of the housing and urban-rural development department), tracing the contract terms corresponding to the payments from the bank transaction records, and applying for witnesses to testify in court about the signing process. For electronic contracts, the original data can be retrieved from the signing platform. In the future, it is recommended to sign multiple copies of the contract, scan and archive them, and back them up in the cloud. For important contracts, attach the contract number to each handover during the performance process. Even if the original is lost, there are multiple recovery paths, so as not to fall into a passive situation where there is no evidence to rely on.

Q3: If the other party denies that WeChat belongs to him, are the chat records still valid?

This is effective, but it requires completing the proof of identity consistency. Common methods include: first, real-name information, by retrieving real-name authentication materials through payment accounts or platforms; second, cross-verifying by binding a mobile phone number with transfer real-name information; third, self-admission in chat content, where the other party mentions identity information such as mobile phone numbers, addresses, and job titles in the records; fourth, historical transaction habits, where previous account reconciliations and contract performance have all been conducted through the same WeChat account. If necessary, you can apply to the court to investigate and collect evidence from the platform operator. If the other party merely denies it verbally without providing counter-evidence, this does not affect the determination. To prevent potential disputes, it is recommended to require the other party to confirm their commonly used contact methods in written documents and explicitly state that "the WeChat account is the same as their identity". This way, future disputes can be directly resolved.

Q4: Are witness statements effective in contract-related lawsuits?

It's effective, but the limitations are obvious. According to the Civil Procedure Law and evidence provisions, witnesses should attend the court hearing and accept questioning. Written testimonies from witnesses who fail to appear in court without a valid reason have weaker probative force. It's best for witnesses to be third parties with no interest in the case, such as delivery drivers or on-site construction workers; testimonies from relatives or interested parties will be subject to stricter scrutiny. Key points for use: sort out the specific facts that witnesses can prove before the trial to avoid general evaluations; apply for witnesses to attend the court hearing in advance and set aside funds; and the effect is best when testimonies corroborate other written evidence. In labor and engineering disputes, witness testimonies are often used to reconstruct the facts of the scene — in a labor case handled by Henglue Law Firm, it was the witness's testimony that the outsider was only a supervisor that undermined the defendant's offset defense and secured the judgment amount.

Q5: When should the evidence for contract disputes be submitted?

It should be submitted within the evidentiary period. The evidentiary period is determined by the court or agreed upon by the parties. In ordinary procedures, it is generally no less than 15 days, and in summary procedures, it may be shorter. If it is submitted beyond the time limit, the court may refuse to organize cross-examination or give a warning or impose a fine. Even if the evidence is submitted beyond the time limit due to intentional or gross negligence but is relevant to the basic facts of the case, it may still be admitted, but at the cost of being warned and fined and giving the other party additional time for cross-examination. Practical suggestions: Start compiling the evidence list immediately after filing the case and mark the purpose of each piece of evidence; If the other party may submit rebuttal evidence, leave room for arranging the order of presenting the core evidence; Submit applications for investigation orders and appraisals as early as possible to avoid crowding at the end of the time limit. Check the original evidence with the lawyer before the trial to ensure smooth verification in court.

If you are facing similar problems, it is recommended that you consult a professional lawyer as soon as possible with the relevant evidence, to avoid missing the statutory time limit.Corporate commercial legal services·Attorney Feng Na·Beijing Henglu Law Firm