A method for adjusting a transmission speed of an electronic aid includes the steps of making a rate negotiation between the electronic aid and a computer, judging whether the rate negotiation is successful or not, if it is successful but data can not be transferred between the electronic aid and the computer, the computer will self-correct the transmission speed of the electronic aid. The present invention ensures that the electronic aid, which can not work normally at high-speed, works normally after deceleration, thereby improving the compatibility of the electronic aid.