Tianfu Sanhui No.1 mine of Chongqing is located in the convergent extreme of Huayingshan scopulate fold belt, which is an area of in-situ stresses concentration. Coal and gas outburst occurred not only frequently, but also high-intensity, and the working seams are all outburst seams, so the research of its three-dimensional initial in-situ stresses field can put forward the suggestion on the production design of coal mine and the prediction of coal and gas outbursts. Based on the geological materials about Sanhui No.1 mine, this paper developes the 3D FEM model, and uses the elastoplastic finite element method and ANSYS program in numerical simulation of the initial in-situ stresses field. Based on the simulation results, it analyzes the characters of the in-situ stresses of Sanhui No.1 mine and K1 coal seam.