The Fault Tree Analysis (FTA) is one of the most important methods in the safety system engineering. With FTA, the fatalness of the various kinds of system can be distinguished and evaluated, not only the direct causes of the accidents but also the potential causes can be deeply opened out. The consequences of accidents described with FTA are intuitional, intelligible, clear thingking and logical. The FTA can finish the qualitative analysis and the quantitative analysis. In this paper, the model of the Fault Tree visulization system is established based on the theory and technology of the visulization, the system functions are determined, the design of the system structure is finished and the FTA visulization system is developed. Furthermore, the integrated analysis environment that conbines the Fault Tree graph creation and Fault Tree dynamic analysis is constructed based on computer. The FTA visualization analysis system supplies high efficiency and correct technology and measures for accidents analysis and safely assessment.