Based on reanalysis datasets of land precipitation,circulation,radiation,and indices representing atmospheric waves,anomalies of the East-Asian circulation and the summer precipitation in North China of the years in which El Niño decayed fast in spring are compared with those of El Niño slow decaying years between 1951—2020;And the reason why El Niño decayed fast in spring in some years was discussed from the perspective of atmospheric wave intensity.Results show that,compared with the other years without El Niño decaying,the precipitation in North China in July and August of the fast decaying years are significantly greater,especially in August.In contrast,the summer precipitation in North China are not significantly greater in the slow decaying years.There was an anomalous anticyclone at 850 hPa over the Philippines to the South China Sea from June to August in the fast decaying years,which was much stronger than that in the slow decaying years.The western Pacific subtropical high (WPSH) at 500 hPa was significantly northward-displaced in August in the fast decaying years,while the WPSH in the slow decaying years was more westward rather than northward.The 200 hPa subtropical westerly jet in August of the fast decaying years was significantly northward,while the corresponding westerly jet in the slow decaying years was slightly southward.And the Walker Circulation from June to August in the fast decaying years was much stronger than that in the slow decaying years.These circulation anomalies in the fast decaying years provided favorable conditions for more precipitation in North China from July to August.According to the composite analysis of near-surface wind,the outbreak of anomalous equatorial easterly wind occurred around the month in which El Niño decayed fast over the Western and Central Pacific.However,in the slow decaying years,the anomalous equatorial easterly wind was much weaker and unsignificant.The convection over the Indian Ocean remained active and spread to the Maritime continent during the fast decay of El Niño.Such continuous active convection very likely induced the outbreak of anomalous near-surface easterly wind by triggering atmospheric waves,and consequently resulted in the fast decay of El Niño.