In order to improve the transplanter automatic operation level and realize remote automatic control of steering operation, with the Kubota NSD8 rice transplanter as the study platform, and under the condition of guarantee the usability of existing steering mechanism, a kind of remote automatic steering system was designed. The system mainly comprised steering actuator and microcomputer control unit, remote transmitter installation and receiver installation, angle sensor, and stepping motor. The system can realize remote automatic control of rice transplanter steering. Experiment on automatic steering performance of remote transplanter was accomplished by the system, transfer function of the steering actuator system was gained via experimental data and exploiting the way of system identification, and the system performance was analysed. The analysis showed that automatic steering system can provide reliable guarantee for realizing remote rice transplanter. It was tested about 180° and 90° of flat ground steering, test showed that automatic steering system can realize steering operation process of field work track predetermined.