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本文主要论证钱塘江干支流和河口的变迁．干流在历史时期的变迁不大，仅50年代以后修建新安江、富春江两水电站．大坝以上沦为大型水库；支流源短流急，中、上游深切山地，下游入平原或盆地，遇通汛期，易造成水患，使河道变迁频繁，浦阳江即是其例；河口的变迁尤大，根据历史记载，河口曾有北大门、中小门和南大门三处，明代以前，汪道主流走南大门，清初经中小门北移，乾隆年间（1736－1795）至今相对稳定出北大门．
This paper mainly demonstrates the changes of the dry tributaries and estuaries in the Qiantang River. The main stream has not changed much in historical period. Only after the 1950s was the Xin’anjiang River and Fuchunjiang Hydropower Station built. Above the dam reduced to large reservoirs; tributaries source short stream urgent, deep in the middle and upper reaches, down into the plains or the basin, case of flood season, easy to cause flooding, frequent river changes, the Puyang River is its case; changes in estuaries According to historical records, the estuary once had the north gate, the small gate and the south gate three places. Before the Ming Dynasty, Wang Dao led the way to the south gate and the north gate moved northwards in the early Qing Dynasty. Since Qianlong years (1736-1795), it has been relatively stable to Peking University door.