An annually-laminated and ~(230)Th-dated stalagmite oxygen isotope (delta~(18)O) record from Yongxing Cave, central China, provides an average annual resolution East Asian summer monsoon (EASM) history covering from 1788-1956. The delta~(18)O values of stalagmite show variations ranging from -9.70 to -7.87 (VPDB), with an amplitude as large as ~1.83. The delta~(18)O profile exhibits clear inter-decadal oscillations over the past ~200 years. A comparison of delta~(18)O records from Yongxing Cave and Heshang Cave, both located in the mid-low Yangtze River Valley, shows a close similarity during their contemporaneous growth periods. The two duplicated stalagmite delta~(18)O records suggest that oxygen isotopic variations are primarily caused by climate change, possibly related to the EASM changes. Power spectral analysis of the delta~(18)O data indicates that the EASM varies at a periodicity of ~60-70 years (above the 95% confidence level).The changes in EASM are comparable to Indian summer monsoon (ISM) changes derived from all Indian summer rainfall (JJAS) over the past ~200 years. The comparison result shows a broad similarity on inter- decadal timescale between the EASM and ISM, but in an opposite sense, with a correlation coefficient of 0.47 (n=141, p<0.001). Furthermore, the EASM and ISM records are compared to a unified ENSO proxy (UEP), which is revealed by Principal Component Analysis of 10 commonly used ENSO proxies. On inter-decadal timescale, weak/strong EASM and strong/weak ISM intervals are linked to cool/warm ENSO phases. This observation might suggest a strengthening influence of ENSO on decadal Asian monsoon variability.