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This paper wants to explore a key technique of identifying and locating the sand exploitation ships using ASAR images. Chenglingji of Yangtze River is selected as the research region. One software module was developed with the IDL (Interactive Data Language) which is a facing matrix, simple visual language. This paper researches on some key techniques based on ASAR images such as filtering and noise reduction, the process of image based on morphology, edge detection, region growth, extraction of ship's shape feature and so on. Comparing with the field monitoring results, this method can achieve 80%-90% accurateness.