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The bad weather conditions such as rain,haze,fog and mist will significantly degrade the video monitoring images captured of basic farmland.Based on the method of dark channel prior(DCP) and in order to avoid the Large distortion,a new dehazing method (MDCP) which samples the large area of highlight to be blurred has been proposed.By testing the basic farmland degradation image under the weather of rain and fog using no reference comprehensive quantitative evaluation model, it indicates that the MDCP algorithm can effectively realize of fog clearing.MDCP algorithm takes the advantages of high efficiency and fast running speed as well.