Effective proof must meet the following three conditions at the same time: 1, which is a reflection of the true will of the parties and an expression of their true feelings, and cannot be forced, threatened, lured or deceived. 2. No violation of relevant laws and regulations; The content of the certificate must comply with the provisions of the law and cannot violate the prohibitive provisions of laws or administrative regulations, otherwise the certificate may be invalid. 3. Do not infringe upon the interests of others. Witnesses can only be punished on the basis of what they have the right to punish, and cannot infringe upon the legitimate interests of others. At the same time, in the proof, it is necessary to clearly identify the facts, the identity of the witness and the time when the certificate is issued. If you violate any of the above points, the certificate will lose its legal effect and need to be reissued in a legal way.

legal ground

Article 143 of the General Principles of the Civil Law of People's Republic of China (PRC) A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.