Based on the injected carrier transportation mechanisms in multiple quantum wells (MQW),non-uniform distribution of injected carriers in MQW was computed numerically. And several parameters,which significantly affect the carrier non-uniform distribution in MQW,were investigated. Results show that with the increase of the number of quantum wells,injected current and quantum barrier height increases the non-uniformity of carrier distribution in MQW,but with the decrease of working temperature it will also decrease.