Abstract: This paper presents an interactive-parameter method which makes the generation of engineering drawings interactive, parameterizea, uniform and practical. Based on the loop data structure and Boolean operation algorithm, the processing of detail and assembly drawings is unified. Driven by the parameter of dimension, the drafting and marking unify. Based on the parameterization, the processing is automatic. The method of interactive-parameter is very practical.This function has been realized in our PLAGE system. The system has been applied in some factories.