Abstract: The compiling and interpreting system of hybrid arc welding robot language(HAWRL)was developed. Firstly, by analyz-ing the characteristics of source code and object code, the architec-ture of compiling and interpreting system, which includes morpholo-gy/syntax analysis, semantic analysis, error handling, symbol table manager and object code generation, was presented. Secondly, on the base of classifying key words of HAWRL, three module of the mor-phology/syntax analysis, semantic analysis and object code generation are developed. At last, experiment was executed to compile and in-terpret HAWRL programs that obtained from all kinds of methods. The results show that the compiling and interpreting system not only can compile HAWRL program to PMAC motion program correctly, but also can help user to debug and revise the source program with errors efficiently.