With the development of the digital technology, television station and information service providers depend more and more on the video detection technology. The principle of the detection of the video advertisement is described based on the following content: shot boundary detection and frame matching. And the key technologies are compared, and the technology suitable for the advertisement detection system is found. By studying the current advertisement detection system, we put forward a modified method to improve the advertisements detection performance. Through many tests on different TV program, the results show that the modified system is effective.