You can apply to the court, or you can apply to a unit with appraisal qualification recognized by the court. Handwriting identification is the identification and recognition of handwriting formed by people's writing activities. People's writing habits are concrete and stable, which are reflected in handwriting. Through the inspection of handwriting, we can determine whether the handwriting in the document was written by several people or by one person, and use handwriting to identify the same person and verify the authenticity of the document. We should understand the relevant situation of the case, clarify the requirements for identification, and review the handwriting material evidence and handwriting samples; Analyze and judge whether the handwriting is normal, whether there are changes caused by camouflage or other reasons; Choose stable characteristics that can reflect the writer's writing habits; Compare the samples with the features found in the samples, and find out the coincidence points and differences; Comprehensive evaluation of the reasons for the formation of coincidence points and differences; Make an appraisal opinion and make an appraisal book.

Legal objectivity:

Article 79 A party may apply to a people's court for an appraisal of the concreteness of the facts ascertained. If the parties apply for appraisal, the qualified appraisers shall be determined by both parties through consultation; If negotiation fails, it shall be designated by the people's court. If the parties concerned do not apply for identification, and the people's court considers it necessary to identify specialized issues, it shall entrust a qualified appraiser for identification. Article 80 An appraiser has the right to know the case materials needed for appraisal, and may ask the parties and witnesses when necessary. The appraiser shall put forward written appraisal opinions and sign or seal the appraisal book.