Irregular space connecting pipe is widely used, but there is a difficulty and challenge in the concrete construction project. Aiming at the problems that complex spatial boiler equipment pipe is not easy to design, this paper proposed the space bending design method based on SOLIDWORKS, analysed and designed connecting pipe for the irregular spatial connection. It uses SolidWorks simulation finite element analysis and optimization analysis. Examples shows that, the methods of irregular spatial connection based on SolidWorks is reliable, which can be widely used in pipe design, and can improve the precision and efficiency of design drawings.