The focus of most paleoclimate reconstructions has been put on speleothem delta~(18)O variability while the paleoclimatic and paleoenvironmental implications of delta~(18)O have many controversies. The contrast between the recent stalagmite delta~(18)O record and the climate change message recorded in the historical document can help to solve this problem. The history of high-resolution summer monsoon variations during the past 700 years was reconstructed by means of precise ~(230)Th dating and the high-resolution oxygen isotopic (delta~(18)O) analysis of SYD-6 stalagmite from the Shuiyuan Cave in eastern Nanling Mountain, China. It is found that the variation trend of delta~(18)O records is consistent with the change frequencies of drought and flood disasters in the southern areas of China as recorded by the historical document since the Little Ice Age, indicating the delta~(18)O record of SYD-6 stalagmite may be closely related to the intensity of summer monsoon and monsoon precipitation. According to the record, we analyzed the summer monsoon variation in eastern Nanling during the past 700 years.