Based on heating method in the temperature tracer method, a new monitoring system that can be applied on the seepage monitoring of rock-fill dam is presented by embedding the fiber Bragg grating (FBG) in the pipes of the water cycling heating system. This new system can be expected to solve the defects of e.g. spatial discontinuity and inefficiency in the current traditional mode. The main substructures of this integrated system are composed by electric boiler, sub-water catcher, heating pipeline, and FBG temperature sensors which will play the function of heating, allocation, transporting and monitoring, respectively. The temperature distribution of heated water along the pipeline can be measured by embedded FBG, and then the seepage field will be derived from the relevance of temperature field and seepage field. Based on seepage mechanics and heat transfer theory, a synthetically method is presented for the quantification calculation of the seepage velocity by combining with experiment calibration, numerical simulation, monitoring data and neural network inversion analysis. To verify the capacity of monitoring system and the validity of the quantitative identification method for the seepage velocity, a series of experiments that take the influence factor of leakage passage and leakage intensity into account are designed for simulating the concentrated leakage of rock-fill dam. This project, with novel academic thought and advanced research techniques, will have broad engineering application prospect and promote the development of monitoring science and technology in civil engineering and hydraulic engineering.