Abstract: In order to solve the problem of mechanical weeding in paddy field and enhance the function of the exiting agricultural machine, a marching type inter-cultivating weeder was designed and tested in the paddy field by refitting a marching-type transplanter in this study. The designed machine was powered with the chassis of a marching type transplanter and composed of frame, power transmission system, mechanism of profiling and depth control and complex weeder including finger roller and blade roller which realized functions of pulling and bury-pressing on weeds during operation. Results of the field experiment showed that under the conditions that the forward velocity of the weeding machine was equipped with complex weeder 0.5 m/s and the weeding depth 50 mm, the cleaning rate was 83.7% and the injury rate of rice seedlings was 4.1%, and work effectively in paddy fields with large and high weeds.