Abstract: The Miaolang substage, which corresponds to the age interval of 7-5 M a, was defined by Xue Xiangxu et a1. in 1995. The typical assemblage is Mianliang Hipparion fauna found in Fugu County, Shaanxi. According to preliminary identification, the chief species of the fauna are Adorocula eximia variabili, Hipparion sp. Chilotherini, Honanotherium sp. Chleuaslochoerus steblini, Eostylocerus blainvillei, Muntiacus cf. lacustris, Cervavilus novorossias, C. demissus, Procapreolus latifrons, etc.. The faunas in this Substage include thee found in Longjiagou, Gansu, at different localities of Xin’an, Henan, at some localities of the Baode area, in the Mahui Formation, Shanxi and in the Lantian Formation, Shanxi. The common features of the faunas are: (1) all faunas contain abundant fossil of Cervidae, such as Eosty locerus blainvillei, Muntiacus lacustris, Cervavitus novorossiae, C. demissus, Procapreolus latifrons, ets., (2) Acerorhinus is the dominant element of Rhinocerotidae and no fossils of rea1 Chilotheerium have been found, (3)most animals of these faunas, have low-crowned teeth, such as Honanotherium，Gazella gaudryi and Chleuastachoerus Steklini, (4) Hipparion，platyodus is the main species of hipparionine in this Substage. They were widely distributed in north China and most of these animals were typical forest dwellers.