Abstract: Based on the reanalysis data of national center for environmental prediction/national center for atmospheric research (NCEP/NCAR) and daily precipitation data in Liaoning province from 1960 to 2006, the atmospheric circulation, wind field, temperature field and humidity field were analyzed by the composite analysis, distance average analysis, average geopotential calculation. The results show that there are obvious differences in height anomaly field at 500 hPa, wind vector field at 500 hPa, temperature anomaly superposition field at 500 hPa and water vapor transport vector field at 850 hPa, based on the comparison of frequent rainstorms month with infrequent rainstorms month in summer under the background of El Nino or La Nina. In the same frequent rainstorms month or infrequent rainstorms month, the corresponding backgrounds of El Nino and La Nina are compared, and the fields as mentioned above also have different characteristics.