Abstract: There are many problems of data processing and visualization in the post-processing of Staad-Pro (a kind of commercial software for CAE of steel structure of boiler). In order to improve the efficiency and veracity of post-processing of CAE, a kind of application software for automatic post-processing and visualization is developed. The numerical results of CAE of steel structure are analyzed and processed in C language. The miscellaneous data is recognized with the data structure theory and database techniques and the needed data for visualization is obtained. The visualized post-processing of CAE of steel structure is carried out in VC+ + and the secondary development tool ARX of AutoCAD,and many more scientific and laconic DWG graphics are generated. The spatial distributions of physical parameters of steel structure can be depicted intuitively. Thus the complex visualization of post-processing of CAE of steel structure is greatly simplified, and the efficiency of visualization is improved.