The parametric design of hydropneumatic recuperator based on the secondary development of AutoCAD using visual basic6.0 is presented aiming at the problems in the traditional design method of recuperator

such as complexity of design process

long design cycle and low design efficiency.The parametric design was realized by inputting the structure parameters into the program interface

which not only can automatically draw engineering graphics from 3D model of parametric design but also can meet the trend of numerical control of modern machining and provide necessary information for the following CAM/CIMS.The feasibility and correctness of the parametric design for hydropneumatic recuperator are validated by an example.