To realize energy balance and power balance of high-power solid-state laser facility, laser performance simulation model (LPSM) is developed to provide real-time prediction for the Technical Integration Line (TIL). This model is used to determine the system setpoints, such as injection energy, injection pulse shape, attenuations, and laser diagnostic settings. Injection energy is predicted by fitting the amplification curve based on diagnostic energy feedback from previous TIL shots, input pulse shape for flat-top pulse output by iterative loop method, temporally shaped pulse shape by the method of gain-fluence curve, and laser power and energy for laser diagnostic settings by beam propagation and amplification code named SG99. Real-time adjustments of the model parameters allow the LPSM to predict energy within 5%, and provide energy balance within the eight beamlines less than 10% (root-mean-square) for shots varying from 0.5 to 4 kJ (1053 nm) per beamline. The LPSM has been a crucial tool in the commissioning of the TIL.