The rationality of spatial environment design and operational parts’ layout design in ATC (All Terrain Crane) cab needs to provide a quantitative basis through objective evaluation and analysis. In this paper, 3-D space model of ATC cab is constructed in accordance with data provided by a new type of ATC in a famous domestic crane enterprise, and the Chinese human database is established based on Human Dimensions of Chinese Adults(GB10000-88). Besides, the interior design ergonomic evaluation system of ATC cab is created by customizing specific toolbars and dialog boxes with VB language secondary development on CATIA software platform. This system can evaluate comfortable areas and reaching scopes of joystick, seat, pedal, steering wheel and other operating devices and give the evaluation conclusions. This provides a feasible and effective design evaluation method for computer-aided interior design of ATC cab.