Based on numbers of published papers, 357 items quantitatively reconstructed precipitation were collected in the Holocene Megathermal (6.5~5.5 ka B.P.) at 285 sites in China. Spatial synthesis method is assigned to assess reliability of the reconstructed results. After the spatial synthesis analysis, 271 items available precipitation records have been gotten to reconstructed the annual precipitation of China in the Holocene Megathermal. The results show that, in the Holocene Megathermal, annual precipitation was higher than today by about 50~300 mm. The increase of precipitation had significant regional differences.