The surface characteristics of 8 main kinds of bentonite in China are dealt with in this paper. The samples include 5 Ca-bentonites taken from Jiutai of Jilin, Longquan of Jiangsu, Choushan of Zhejiang, Xinyang of Henan and Heishan of Liaoning respectively and 3 Na-bentonites collected from pingshan of, Zhejiang and Toksun and Xiazijie of Xinjiang. And the bentonite sample from Wyoming, USA was used as a check.