Machine code translation converts machine code into assembler code, commonly used in disassembly, debugging, virus analysis and other fields. Machine code translation is based on a series of tables which are used as the description of the instruction set, including the instruction set format table, the op-code table, the addressing table, and so on. Traditional translation methods query these tables step by step to find the corresponding assembly code. Traditional methods are usually slow because of the complexity of table look-up process. This paper proposes a method based on pattern matching. By simplifying the table look-up process, the speed of the machine code translation to some extent. And at the same time, it's much easier to develop and maintain the translation program by this method.