This paper proposed to get 3D process model and final part through by process language understanding and graphics understanding. Based on the characteristics and structure of the machining process language, machining process language could be represented by ldquofour elementsrdquo. Then constructed the knowledge base based on ontology. Through dividing the process statements into five ldquoblocksrdquo and extracting the process semantic information, proposed a process language understanding method. At last, combined with the graphics understanding, we developed a prototype system and gave a case. The result showed that the method was effective.