Handwriting identification belongs to the category of document identification, and it is a technology that relies heavily on empirical theory. The result of the evaluation opinion depends largely on the professional ability and work experience of the appraisers. In the field of handwriting identification, the authoritative institutions of handwriting identification in China are:

-Guangdong Mingjian Document Judicial Appraisal Institute: As one of the appraisal institutions with the largest number of document cases in Guangdong Province, handwriting appraisal belongs to the category of documents and is a more reliable choice.

-China Judicial Appraisal Center, as the competent department of judicial appraisal institutions in China, is one of the authoritative appraisal institutions with the highest level and recognized by the state.

-The Institute of Science and Technology of Beijing Public Security Bureau is a scientific research institution directly under Beijing Public Security Bureau. It has a high professional ability and technical level in domestic public security organs and is one of the more professional appraisal institutions.