Abstract: According to the stoping design requirements of the deposit with sublevel backfilling in South Area of Sijiaying Iron Mine，the research is carried out about engineering geological condition and exploitation technical condition of the mineral deposit.On the basis of ore-body's geologic structure and the characteristic analysis of the surrounding rock，the ore-body and surrounding rocks are classified，and the rock stability evaluation is made so as to determine the mechanical parameters of rock mass.Then，the spatial form and the grade distribution of deposit are shown by using the 3D geologic model of deposit which is built with use of the exploration and drilling data.Thus，By means of engineering experience and previous research results，the ground stress parameters of the ore district are preliminarily discussed.The research results lay a foundation for mining design with back-fill method and decisions optimization.

Key words: Iron mine, Engineering geology, 3D geologic model of deposit, Exploitation technical condition