Abstract: In order to find and solve the performance bottleneck of information system more accurately,this article studied the technology of information system detection and optimization in the process of performance testing.The system performance test was divided into four parts: CPU, memory, I/O and network. The article explored the principle analysis and monitoring methods, and studied the reasons for the bottleneck of the system. The processing capacity and response time of the system are optimized by corresponding optimization methods, which makes the system run smoothly under the pressure of large concurrency and improves the user experience.