Abstract: By introducing the 3D geological modeling with principle and method of application of GOCAD software, taking deep geological survey in Benxi region for example, the authors analyze the stratum, structure and rock mass and establish 3D models. Each geological 3D model can reflect the distribution pattern of geological bodies in 3D space better, meanwhile the 3D shape of required target geological body can be established according to different research objects. Deep geology 3D modeling relies not only on surface information, but also the technical constraint of drilling and geophysical data to improve the model, which would conform to geological regularity and truly reflect geological phenomena, and could help geologists recognize geological occurrence and improve work efficiency in the future.