Abstract: The main orebody ZnV3 of Jinchanghe Mine in Baoshan is a gently inclined medium-thick orebody,and the boundary between ore and rock is clear,belonging to a moderately stable type.The proportion of large-diameter longhole lateral caving and filling mining is 78 %.The selection of bottom structure has become the key to decide whether the mining method can be successfully applied to mining the orebody.Based on the mining technical conditions,2 bottom structures,that is V-shaped trench ore reception and flat-bottomed ore reception,are put forward,and the engineering quantity,working efficiency,economy and safety of the 2 bottom structures are compared and analyzed.Finally,it is concluded that the bottom structure of V-shaped trench ore reception is more suitable for the mining of main orebody ZnV3,which can provide technical support for safe,efficient and low-cost mining of Jinchanghe Mine in Baoshan.