【Abstract】 Objective To study the operative technique of modified transpetrosal-presigmoid approach in microsurgical treatment of petroclival tumors. Methods the clinical features,operative methods,result of operation and postoperative complications of 10 cases of petroclival tumors resected via the modified transpetrosal-presigmoid approach were analyzed retrospectively. Results Total resection of the tumor was achieved in 10 cases. The main postoperative complications were the transient aphasia and the decrease in muscle strength because of temporal edema in 2 patients, the CSF collection under the skin flap in 2 patients. They were all successfully recovered after management . there were no bone defect、CSF leakage、severe injury to the cranial nerve and the venous sinus after operations. Conclusion The modified transpetrosal presigmoid approach is a preferable method for petroclival tumors because of several predominant advantages.