Abstract: After the discovery of Homo erectus and associated mammalian fauna from the Huludong Cave at Tangshan , Nanjing , Jiangsu Province (Mu et al. , 1993 ; Huang , 1996 ; Dong , 1999) , a new mammalian fauna was discovered in 2000 from the cave deposits at Tuozidong (32°03′N , 119°01′E) of 800 meters west of the Huludong. The relationship of these two faunas arose the interests of paleontologists. The recent study of the equids from Tuozidong shows that they are very significant and they are described below.