Based on the analysis of the existed conceptual models and their main problems, a new 3-D conceptual model for bedrock fracture groundwater at Zhangzhou Geothermal Field is established and solved. The results show that temperature distribution of bedrock fracture groundwater is strongly controlled by fault-fracture system and a high temperature cylinder in the fault formed by convection of hot water heats top surface of bedrock and thus forms the center high temperature part. Heat flux reaches a maximum at center high temperature part and reduces towards the edge of the geothermal field. The Quaternary pore water movement reduces the maximum and local heat flux. These are important for guiding and optimizing the future exploration and exploitation at Zhangzhou Geothermal Field.