There are many patients who have to undergo craniotomy because of various factors, such as severe cranial trauma or craniosynostosis, and many of these cases have to be handled by craniotomy. However, if the patient’s intracranial pressure increases during the craniotomy, decompression of the greater trochanter should be performed in a timely manner. Decompression of the large bone flap is characterized by wide exposure, which allows the surgeon to see the intracranial tissues more clearly in order to achieve timely decompression and hemostasis, while releasing the pressure and avoiding brain herniation so that the patient’s situation is not too dangerous. How many levels of surgery is cranial debridement and decompression and is it risky? In clinical practice, decompression of the skull flap is a level II procedure. Although it carries certain risks, as long as the entire procedure is strictly controlled, there will be no infection or rebleeding after surgery. In addition, it should be noted that debridement decompression surgery is performed to open the skull window of the patient, so it is inevitable that cranial defects will remain after surgery. Cranial defects are also a problem that needs to be taken seriously, as they can affect the patient’s quality of life and pose a threat to safety and health if left untreated for a long time. Therefore, in order to avoid more damage caused by cranial defects, patients who are eligible for surgery are recommended to go to the hospital for cranial repair surgery about 3 months after surgery. At the same time, in order to improve the success rate of skull repair surgery, it is important to choose good repair materials and leave it to doctors with better technical experience.