It is unrealistic to configure the different parameters and test analysis in a real cloud computing data centers. Because of the multi-dimensional factors such as the application service are effected from the complexity components, configuration, and deployment; it is most important to use Simulation tools to effective for resources and task scheduling strategy simulation experiment. Based on these, we introduce three major cloud computing simulation platform in this paper:CloudSim, CloudAnalyst, CloudReports, analysis and comparion on the characteristics of its own, separately proceed the three kinds of simulation experiment of simulation platform by the usual task scheduling strategy, evaluates and analyzes its performance. The existing defects are improved and optimized.