Legal analysis: generally speaking, a letter of guarantee for beating needs to include the following five contents. The details are as follows: 1. Write clearly the plaintiff's name, gender, age, nationality, address, ID number and telephone number; 2. The basic information of the defendant is consistent with that of the plaintiff; 3. Litigation request: request the defendant to compensate the plaintiff for medical expenses and other expenses; 4. Facts and reasons: the fact, evidence and legal basis of being injured; 5. Finally, the bearer shall sign and write down the date.

Legal basis: Article 121 of the Civil Procedure Law of the People's Republic of China. The following items shall be recorded in a complaint: 1. The plaintiff's name, sex, age, nationality, occupation, work unit, domicile and contact information, the name and domicile of a legal person or other organization, and the name, position and contact information of its legal representative or principal responsible person; 2, the defendant's name, gender, work unit, address and other information, the name and address of the legal person or other organization and other information; 3, the claim and the facts and reasons on which it is based; 4. Evidence and sources of evidence, names and residences of witnesses.