In the process of gas flooding development of tight reservoirs，gas channeling usually leads to poor development performance or even shutdown. There was no mature theoretical method to calculate the percolation characteristic parameters after gas injection in the tight reservoirs. Based on the principle of percolation mechanics，the characterization functions between oil-gas-water three-phase saturations and relative permeability are established by using the Stone model. By analyzing the function relation among the dynamic parameters，the percolation characteristics parameters and relative permeability，the saturation-water cut-gas-oil ratio（GOR）relation charts are established. With the help of these charts，the percolation characteristic parameters are reversed by using dynamic development parameters. The dynamic development parameters include water cut and GOR，and the percolation characteristic parameters include the fluidity of underground mixed fluid，average reservoir permeability and average permeability of gas channeling channel. This method is applied to perform the dynamic reversion of reservoir percolation characteristics parameter in the well group with gas channeling. The results show that the inversion results are consistent with the characteristics of single-well gas channeling and production dynamic behavior. The average permeability of gas channeling wells during production is much lower than that of wells without gas channeling. The higher the degree of gas channeling is，the greater the average permeability of gas channeling channel will become，which indicates that there are obvious fractures or gas channeling channels in the layer.