Cherts occur from lacustrine grainstones and packstones of the middle part of the Zhuanchengzi Bed (Yixian Formation, Lower Cretaceous) in Westerm Liaoning Province. Four lithofacies are recognized. The chert in brecciated-nodular limestone includes nodular, lenticular and cloddy types morphologically. Moreover, two types could be defined base on their differentiation of colour and translucency. The chert consists of microcrystalline quartz and chalcedony with small calcite and dolomite crystals lithologically. These facts imply that the environmental setting might be considered as a short-lived isolated ponds in very shallow depressions on the floodplain. Nevertheless, drought climate as well as the volcanic activity reinforced the formation of the cherts.