The best treatment of pulp exposure in deep caries of milk teeth, clinically, in the process of treating deep caries of milk teeth, if there is accidental pulp exposure in tooth preparation, the vitality of pulp should be determined according to the size of pulp hole, pulp state and pulp bleeding amount. If the pulp hole is in the size of a needle tip, and the dentin around the pulp hole is healthy dentin, direct pulp capping method can be adopted, and the commonly used capping agents are calcium hydroxide, IROOT and MTA, and then tight crown closure is performed. If the pulp hole exceeds the size of a needle point hole, or if there is more pulp bleeding, the best way is to remove the diseased pulp and retain the vital root pulp. If the patient is found to be in pain during local anesthesia, in addition to indicating poor anesthesia, it may also indicate that the affected tooth is in a state of congestion, or there is a lot of bleeding in the process of live pulpotomy, and it is not recommended to perform live pulpotomy, and root canal treatment is recommended in this case. After the live pulpotomy and root canal treatment, it is generally recommended to perform pre-crown restoration to ensure the crown closure, prevent the occurrence of secondary caries and improve the success rate of treatment.