1, legitimate defense must be aimed at protecting legitimate rights and interests from unlawful infringement;

2. Self-defense must be directed against the wrongdoer himself;

3. There are violations of laws and regulations;

4. It must be that the illegal infringement is in progress;

5. Self-defense cannot exceed a certain limit;

legal ground

Article 20 of the Criminal Law of People's Republic of China (PRC)

In order to protect the state, public interests, personal, property and other rights of oneself or others from ongoing illegal infringement, stopping illegal infringement and causing damage to the illegal infringer, it belongs to self-defense and does not bear criminal responsibility. If justifiable defense obviously exceeds the necessary limit and causes great damage, criminal responsibility shall be borne, but the punishment shall be mitigated or exempted. Taking defensive actions against violent crimes such as assault, murder, robbery, rape, kidnapping, etc., which seriously endanger personal safety, and causing casualties of illegal infringers, is not excessive defense and does not bear criminal responsibility.