Based on the Poisson’s equation of charge distribution and the transport equation of carriers, the effect of doping concentration and disordered degree on the mobility of carriers in the Alq3 flexible organic lightemitting diodes has been studied selfconsistently. The density of states of the carriers was described with the double Gaussian distributions because of the energy disorders of organic molecules. It was found that the carriers' mobility is almost fixed with doping concentration smaller than 11020cm-3. The carriers' mobility increased nonlinearly when the doping concentration was larger than 11020cm-3, in well agreement with the experimental results. It was also showed that the increase of mobility as a function of doping concentration for smaller disordered degree is faster than that for larger disordered one. With low doping concentration, the disordered degree has little effect on the mobility. Finally，the doping concentration and the disorder degree dependence of the mobility is used to simulate the variations of the luminescence power density of the device with the voltage bias. It was indicated that the mobility results related to the doping concentration and the disorder is very important for developing organic LED with high performance.