The results presented in this study suggest: (1) EASM and summer precipitations over East China have undergone considerable inter decadal variations over the last 100 years. (2) The Inter-decadal variation of EASM is characterized by four major strong-weak phases, including two strong EASM periods, that is, the period of 1900～1910 and that from the late 1930s to end of 1960s, as well as two weak EASM periods from late 1910s to the end of 1930s and after 1970s. Corresponding to the inter-decadal variation of EASM, the atmospheric anomalous patterns for strong EASM years are completely distinct from that in weak EASM periods. (3) The Summer precipitation over East China is related to the EASM on the inter-decadal scale to some extent. But it is worth careful consideration that the decadal background of annual variabilities of EASM is different in time, and the relationships between EASM, SSTA and summer precipitations are changeable with time.
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