According to Chinese anthropometry data and ergonomics knowledge, a general 3D parametric Chinese manikin was built. Integrating with automobile design standard, engineering design knowledge and expert experience, a knowledge based engineering system for automotive interior layout was developed which applied both the object-oriented knowledge representation and rule-based reasoning technique. Some ergonomics functions, such as the verification of visual field, the designing of pedal and control handle, the checking of manipulative range and control forces, the validation of safety belt mounting position and so on, were all accomplished.