As the image channel is the main module of the pod, it is the bridge which connects the guided missile and aircraft and the detection of it is important. In order to realize the fast and accurate detection of the image channel, this paper uses the idea of modular design, and designs a convenient and fast method for image detection. The hardware of the system is based on the industrial control computer and the PCI bus technology is used to realize the transmission and collection of the image signal. This paper designs a kind of convenient and fast channel image detection system, proposes an image quality assessment method, which combines the gradient based similarity deviation and brightness. By using the threshold value we can easily judge whether the image channel can be used or not. The computer simulation results show that, this system can achieve the detection of image channels, improve the testing efficiency and meet the test requirements.