The Performance testing is the process of collecting performance indexes of all system aspects through simulating load in real conditions to evaluate system endurance and stability under normal operating conditions, and to analyze system performance and bottlenecks. Using LoadRunner testing tools, this paper introduced detailed process and methods of performance test, through performance index and performance testing methods. According to the County Level Finance Integration Application Platform features, this article designed simulated real business scenarios, obtained performance index using pressure testing and load testing, analyzed performance bottleneck through web page diagnostics and graphs for correlation, and brought improving methods.