The dam site conditions of Sifangjing water control project of Wentanghe river in Yichun city are complex，with unfavorable structures such as weak interlayer and caves.According to the geological conditions，two kinds of dam type schemes，namely clay core wall dam and concrete gravity dam，are proposed.Combined with the layout of the hub，construction layout，construction period，slope treatment，engineering quantity and static total investment，the clay core wall dam is selected as the suitable dam type.A dam type comparison reference can be provided for similar projects.