An important aspect of the impact identification is the impact location identification. Accurately identify the impact location will help to determine the possible location of the damage, and accelerate the detection of the critical parts of the structure. Although there are someexisting recognition technologies, they either need a lot of training data, or require a lot of calculation and sensitive to boundary conditions. Establishing the relationship between impact force and impulse response, the present paper obtain the relation between the piezoelectric signal and energy flow (Poynting vector). Based on the important information of energy, impact location and their energy can be obtained. Finally, the simulation results confirm the effectiveness to the proposed method. This is a simple, computationally efficient method giving a solution to the bending wave propagation at any point of the structure whatever the location and waveform of the input force.