For real-time libraries, the effects of batch reading and writing, concurrent operation, single large number reading and writing, memory usage and network usage on real-time performance are analyzed. On this basis, a test system with real-time library function and performance testing is designed. The software part of the test system is implemented on Qt/C++ in Linux system. The practical application shows that the test system is effective, and greatly improves the accuracy of the test results and test efficiency, and the system has a friendly interface and is easy to operate.