Abstract: Jiaojia and Sanshandao fault gold belt is a typical area where great breakthrough has been made in the deep prospecting of Jiaodong area, but the deep geological structure and the prospects for further prospecting are not clear.In this paper, a 3D comprehensive geological and geophysical model of the gold deposit belt is established, which is based on the geophysical 3D forward and inversion technique constrainted by high precision gravity and magnetic data and the CSAMT data.The model shows the deep 3D features of Neoarchean metamorphic rock series and Mesozoic granitoids and fault structures related to gold mineralization, in particular, it reveals the spatial variation characteristics of the attitude of the Jiaojia faults and Sanshandao faults, as well as the trend of their meeting.It provides important evidences for further deep prospecting and related theoretical research.The study shows that the 3D geological modeling method based on geophysical forward and inversion is suitable for the areas where the geophysical work is done more and the deep geological structure information is lacked.It can improve the reliability of the model to a certain extent and has a certain significance of popularization.