Water hazards with emergent property were very common in coal mine industry, which hindered normal production schedule and brought potential menace including worker casualty, financial loss, etc. All of these showed that exploration and reconnaissance of geological work, as well as combination of water hazard prevention and coal mining geology needed to be strengthen, influence factors of geological disaster needed to be analyzed. Taking valid measures not only controlled hindden danger but also ensured personal and property security. Based on study of this combination, development status of chinese geological work was described, its main job contents were analyzed briefly, and its necessity was discussed.