To investigate the influence of the parameters in the riparian zone hydrothermal coupling model on the finite element calculation results of the temperature and lateral hyporheic exchange rate, the sensitive parameters of this model were identified using the orthogonal test method. The results show that the porosity n has the greatest influence on the temperature output results of the hydrothermal coupling model of riparian zone. For the lateral hyporheic exchange rate, the influence of hydraulic conductivity ks is the largest, whereas that of the other parameters are relatively small. Therefore, in the inversion or calibration of the parameters in the hydrothermal coupling model of riparian zone, the porosity and hydraulic conductivity are recommended to be selected as the key parameters, while the parameters with low sensitivity can be determined by engineering analogy or other methods, so as to ensure the calculation accuracy and improve the calculation efficiency.