///Components of the clay mineral illite, smectite, kaolinite, and chlorite were measured and analyzed at eleven horizons from eleven observed sections to interpret the Early-Mid Cretaceous paleoclimate in the western Zhejiang and Fujian provinces, Southeast China. The results show that it was arid-semiarid climate of tropic-subtropic in the Early-Mid Cretaceous in Southeast China. There could be an interruption of hot-humid climate in the early-Aptian and early Cenomanian in western Zhejiang Province that could be attributed to relatively developed vegetation and larger lacustrine area. And short durations of dry-cold climate could have happened in the Valanginian in western Fujian and in the early Aptian, late Albian, middle Cenomanian in western Zhejiang Province.