Abstract: It is an important direction of the software development technology to use many kinds of languages into mix programming flexibly.This paper discusses in detail the method about Delphi and assembler language mix programming,then provides an application example．Mix programming method can exert fully each advantage,the Delphi being object-oriented,visual and the assembler language taking little memory and carrying fast.This method can well improve the performance of the software.

Key words: Delphi, assembler language, mix programming, parameter transfer