The most abundant Amynthas earthworm species was located in China. It is critical to shedding light on the distribution and ecological adaptability of Amynthas for exploring earthworm ecological functions. The previously reported Amynthas species and our own collected species during 2006﹣2016 were studied. The distribution information was gathered for all the specimens, and the Amynthas species distribution map was drawn (Fig. 1). The bioclimate parameters were extracted from the worldClim website following a Principal Component Analysis to clarify the key factors which affect the geographical funa of Amynthas in China. The result shows: (1) The precipitation and temperature are the crucial aspects. The influence magnitudes of precipitation factors were equivalent. The order of affection under the temperature aspect is extreme temperature hydrothermal synchronization > annual mean temperature (Appendix 1); (2) The areas with better hydrothermal conditions (e.g. South China Region) are more conductive to the distribution of Amynthas than those with poorer hydrothermal conditions (e.g. North China Region and North China Region) (Fig. 2). Our results suggest that there are still numerous Amynthas new species waiting to be discovered, and new species records reported in the novel area is exceedingly useful. Importantly, the precipitation and extreme temperature produce the most significant effect on the distribution of Amyntas species which tremendously developed in South China Region due to the perfect ecological suitability.