The research has adoped the DirectShow technology to get media data from audio and video equipment and solve after-treatment problems. With the increasingly wide application of multimedia technology, users's requirements of multimedia products are becoming higher and higher. The early multimedia software, highly correlated with audio and video equipment, and with limitations such as poor commonality and the function expansion difficulty, can not meet users's needs. Based on the characteristics of DirectShow system's full support to hardware, and hardware's independence, this article has proposed a design method of applying DirectShow technology to solve problems that multimedia software is limited by equipment. Tests show that, the method has a chieved the expectation and will have a good application prospect in the field of multimedia.