Separating the cloud data and clear skies from the satellite remote sensing data is the important work of satellite data process. The regression forecast method and the PaūTa criterion of cloud detection is used in the process of the brightness temperature date from the twentieth channels of MODIS.According to comparing the experimental result with the actual condition, it shows that the regression prediction method is effective to the cloud detection of a coastal area. This method is not only爏imple燽ut燼lso爀ffectively.營t牋also applies爐o 爌rocess爉ass燿ata爁or Similar areas.