The invention provides a method for enhancing the function of a switch statement based on a C language family. The method comprises the steps of step one, writing a source program containing the switch statement by a user, wherein selective factors of the switch statement comprise constants and an expression; step two, reading in the source program by a compiler through a pre-compiler program, carrying out grammatical analysis, semantic analysis and lexical analysis on the source program, and generating the switch statement in the source program into corresponding enhancement type switch statement target codes. According to the method provided by the invention, the function of the switch statement in the C language family can be stronger, the original selective factors-constants can be processed, a complicated condition expression can also be processed, the advantages of clear logic and clear hierarchy of the switch statement are reserved, the capacity of processing complicated conditions is also obtained, the function of the switch statement is enhanced, and the programming efficiency and the code quality are increased.