Stalagmite record is an important pillar in Quaternary research. But some query arose for the δ18O of stalagmites stand for summer monsoon in China monsoonal area in recent years. The key point is stalagmite in monsoonal China didn’t bridge the modern climate and paleoclimate by the index of δ18O. In order to solve the question above, we chose a 50 years continuously growth modern stalagmite from Maomaotou big cave. After compare with the stalagmite F4 from Fengyuyan Cave in Guilin and other stalagmites from monsoonal China, δ18O of stalagmite DY-2 from Maomaotou big Cave can stands for local summer precipitation, and regional climatic signal as well. Which show stalagmite δ18O becomes heavier when the summer monsoon gets weak in decadal scale, vice versa. But compare with the different vapor inflow corridors, we didn’t found obvious relationship between moisture vapor change and stalagmite δ18O. Besides Maomaotou big cave, though stalagmite δ18O from Yuhua Cave and Heshang Cave show synchronous variation with Maomaotou big Cave, no obvious relationship found between the local precipitation and the two caves. Although summer monsoon intensity variation make the stalagmite δ18O show synchronous variations in monsoonal China, the local precipitation are more complex and not all stalagmite δ18O stand for local precipitation in monsoonal China.