The legitimacy of writing legal documents is mainly reflected in three aspects:
First, the contents of legal documents are legal. We should correctly apply substantive law and procedural law; Perform legal procedures. A large number of legal documents should solve substantive problems, so the principle of "taking facts as the basis and law as the criterion" must be observed when making them, and the principle of adapting to substantive law should also be adhered to when describing facts, demonstrating reasons and drawing conclusions.
Second, the writing of legal documents should have a certain legal basis, mainly following the procedural law, especially some important legal documents, and even more inseparable from the provisions of the procedural law.
Third, legal documents must fulfill legal procedures. This is done to ensure the legitimacy and validity of legal documents and avoid formal defects affecting the effectiveness of legal documents.