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With the help of the negative pressure adsorption climbing robot platform which can move on the vertical wall smoothly, two cameras of different resolution are fixed on the front holder of the robot. Two independent wireless communication networks are designed for the defect detection system, one is used for robot movement controlling, and the other one is used for transmitting video information of the wall. The video information of the nuclear plant containment is sent back to the software monitoring platform installed on local PC, the video is pre-processed by the monitoring platform for real-time playing, and meanwhile the video information is transferred to the defect detection algorithm module. Once defect is detected, a stop signal is sent to the robot by the software monitoring platform wirelessly, and the input video stream is switched to the high definition camera, and a high definition picture which contains the defect information is snapped and sent to the defect measure module. Using the measure tools in the measure module, defect data of the containment will be measured and then stored into the backend database. The backend defect database is very helpful for browsing history data and monitoring dynamic change of the containment defect. 