Using AVHRR data of NOAA polar orbiting meteorological satellite ,the image characters of precipitation cloud and precipitation area from CH3A(1.58—1.64μm) are analyzed. The differences between CH1(0.58—0.68μm) and CH3A can reflect the information of precipitation and precipitation probability. The method of synthetic precipitation identification using AVHRR multi-channel satellite data is discussed. The precision of the method is higher.