Abstract: In order to achieve the uniform humidification of brown rice by countercurrent moisture conditioning machine, the effects of different technical parameters (height of nozzle, angle of disc, rotational speed of grain cleaning finger, et al) of key parts of moisture conditioning machine for brown rice (moisture of 12.0%) on humidification uniformity were studied by quadratic regression rotary combination experiments. Software SAS was used to analyze the effect of height of nozzle, angle of disc and rotational speed of grain cleaning finger on humidification uniformity. The standard deviation of moisture reached the smallest, which was 0.04, in the storehouse of the moisture conditioning machine for brown rice, when the height of nozzle was 242.05 mm, the angle of disc was -8.41° and the rotational speed of grain cleaning finger was 77.1 r/min. The results provide for the promotion and application of the moisture conditioning technology.