The invention discloses an electric bicycle brake force distribution system including a driving circuit connected to a hub motor for regulating travel speed of that electric bicycle by controlling rotation speed and steering of the hub motor. The speed sensor is connected with the hub motor to collect the driving speed of the current electric bicycle. The pressure sensor collects the pressure of the rider. Six-axis gyroscope collects the driving gradient of electric bicycle; the controller is connected to a speed sensor, a pressure sensor, a six-axis gyro and a drive circuit to adjust the PIDcontroller parameters by fuzzy inference to stabilize the slip rate of the electric bicycle near a preset value according to the pressure of the rider, the driving gradient of the electric bicycle andthe driving speed of the current electric bicycle. The braking force distribution system of the electric bicycle overcomes the safety hidden trouble when the electric bicycle is braked in the prior art, realizes the braking of the brake, and improves the safety when the brake is braked under the condition of obtaining the shortest braking distance. The braking force distribution system of the electric bicycle overcomes the safety hidden trouble when the electric bicycle is braked in the prior art.