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Abstract As an important facility, the tower crane plays an important role in construction industry. The tower crane belongs to the arm rack type crane. Its arm is hinged on the high tower body, and it may rotate. It has longer arm, dexterous structure. What’s more, it is easy to be assembled, disassembled and transported. It is suitable for the open-air work and mainly used for industry and civil construction Based on the design of the similar tower crane, this design is composed of the system design and the tower top design of the QTZ40 tower crane. In the tower top design progress, it has carried Finite Element Method on the analysis computation, and used ANSYS10.0 software. According to the entire machine main performance parameters, various organizations type and the steel structure pattern have been determined. Through the reasonable simplification of the tower top, the tower top finite element model is established by applying ANSYS10.0 software, and then it’s exerted various operating modes loads, and carried on the solution. Then ANSYS10.0 software can calculate various nodes stress situation, the axial stress various units receive, and the tower top distortion size under various operating modes. Also it can demonstrate the animation in the loads-carrying process on the tower top, which has clearly displayed the stress performance of the tower body under various operating modes. The design for the QTZ400 tower crane and lifting the whole set of frame design, divided into the following aspects: First, to design, including the balance weight calculation, calculation and wind machine tower crane anti-tipping stability calculation; Secondly, tower top design, including tower top force analysis and model simplification and finite element analysis and check analysis (including strength check and stiffness check and stability check). Through the revision of the model parameters, three different schemes have been prepared for the analysis comparison, which is carried on the different models. Because the stress condition and stiffness condition of different model are compared under the same operating mode, and a comprehensive analysis of the intensity and the stiffness condition is carried on, a most reasonable model parameter can be obtained. Through the intensity and the stiffness examination regarding this model, then the final parameter result of the tower top can be obtained. Key words: QTZ40 tower crane Tower top Finite element analysis ANSYS10.0