［Purposes］ The paper aims to explore the problems of low efficiency and poor accuracy of diagnosis methods of current construction process rework event cause.［Methods］ Taking the analytical method of system thinking as the framework, the process rework cause system was constructed; Introducing the fuzzy theory into the fault tree, the probability of the basic events was quantified; The bidirectional inference algorithm of Bayesian network was used to calculate, and the cause system was comprehensively analyzes according to the importance degree of the root node; Finally, an analysis method based on fuzzy fault tree and Bayesian network was proposed.［Findings］ When the probability of the process rework is high in the system, the rework events are ranked from strong to weak in order of cause: unqualified construction materials, material damage caused by improper on-site storage, low technical level of professional construction personnel and replacement of construction equipment.［Conclusions］ Most of the rework events of construction projects can be located and identified by management analysis method, which will provide a certain guarantee for the overall quality, cost and duration of construction projects.