The invention discloses an electric steering system. The electric steering system comprises a mechanical connecting rod, a first wheel, a second wheel, an electric motor, a first speed sensor, a second speed sensor and an electronic control unit. The connecting rod comprises a steering column and a rack connected to the steering column in an operable mode. The first wheel and the second wheel arerotationally connected to the opposite end portions of the rack. The motor is attached to the connecting rod in an operable mode and used for supplying steering assistance. The first speed sensor is configured to detect the rotation speed of the first wheel, and the second speed sensor is configured to detect the rotation speed of the second wheel. The electronic control unit is configured to receive a first rotation speed signal from the first speed sensor and a second rotation speed signal from the second speed sensor, calculate a first rotation speed difference between the first wheel and the second wheel, assist in value estimation of the angular position of the steering column and be used for controlling the electric motor.