Artie's letter of understanding should first state the specific circumstances of the case, such as the cause of the case. Secondly, state the will of the forgiver. For example, I think his repentance is very good, his confession attitude is sincere, and he has learned his due lessons. I am willing to forgive him. Therefore, I understand Zhang XX's behavior and ask the judicial organs to give Zhang XX a chance to turn over a new leaf and turn over a new leaf according to the principle of "education first, punishment second" and handle it lightly. Finally, the signature place should have the signature of the forgiver and the specific time. Pay attention to the format must be complete, so as to do it.