Tropic west pacific is the key area which infect precipitation in north of changejiang river greater ; middle north pacific is the key area compacting precipitation in middle and down changjiang river valley and heavier ; and middle northwest pacific - low latitude mid - east pacific are key areas infecting precipitation in north china more obviously 江北降水的关键冈影响中国长江中下游地区及其两侧降水的关键区在中纬中部北太平洋；影响中国东北降水的关键区是中纬西北太平洋与低纬中东太平洋的反向耦合结构。
