Abstract: With the development and spreading of computer-aided design (CAD) technology, it is the trend to use three-dimensional design software for parameter design. Based on Pro/E (Pro/ENGINEER) strong secondary development platform, with the matrix concave PDC bits commonly used in the coal industry as example, on the basis of systematically analysis of the correlation of structural features and main parameters of concave bits, the paper has established technology system of the related parameters for structural design of bits. Design model of PDC bits was set up by using the relationship of Pro/E, parameters and program modules. The design was carried out by using Φ65 mm matrix PDC bits as real example. The results showed that the developed model can quickly and accurately draw three-dimensional and two-dimensional structural diagrams of bits, not only standardizing the designing flowchart, but also improving the quality and efficiency as well as reducing the error of drawings.