The hydrological and geological conditions are studied with the dynamic observation record of long-term discharge of the exploration tunnel system and the data of pumping test in drill holes. The hydrogeological analogy method and the Q-S curve extrapolation forecasting method are adopted to forecast and compare the inflow of the production tunnel system in mining area. The forecasted inflow by the hydrogeological analogy is fairly close to the actual situation. The maximum inflow can be used as the basis for the design of discharge of the production tunnel system. The hydrogeological analogy method can also be applied in other mines with similar conditions.