Abstract: Abstract: Screw conveyor is one of most important agricultural machineries for crop harvest and fiber materials processing. The advantages of screw conveyor include simple structure, small volume, compact total size, easy operation and management, and good seal. There are 3 major problems in use that are high loss of power, low productivity and transmission inefficiency. This study was to explore the method to reduce power consumption and improve efficiency and productivity in transportation. First, with stress analysis of the screw blade, the research found the factors that influenced the force of the blade. This research also designed blade stress test system and power test system by using thin-film pressure sensors, data acquisition unit, signal receiver, torque speed sensor and computer. The experiment was implemented by taking the screw conveyor as experimental platform, which was developed by the project group. The parameters of the experimental platform were as follows: the conveying gap length was 2 500 mm, the diameter of the screw blade was 250 mm, the diameter of the center axis was 60 mm, the pitch was 200, 250 and 300 mm respectively, and the space between the screw blade and the casing was 5-8 mm. The experiment samples were from the corn stalks rubbed and broken by the 9R-40 type rubbing machine, which had less than 180 mm length, 2-8 mm width, and 43.98% moisture content. Based on the performance index such as pressure on the blade, transmission power, productivity and transmission efficiency, the experiment studied the impact of pitch, speed, and feeding quantity on transportation performance. The results showed that: 1) Under the same pitch, the closer to the outer edge, the greater the pressure on the helical blade, and the pressure at inner diameter was the minimum. On the same shaft, the pressure was different at different points of screw blade, the closer to the spout, the greater the pressure on all parts of the blade. 2) When the speed was 58 r/min and the feeding quantity was 70 kg/min, with the pitch increasing, the pressure on each part of the blade increased, the productivity increased and the transmission efficiency was enhanced. When the pitch was 250 mm, the average power consumption was 294.63 W which was the minimum. When the pitch was 300 mm, the transmission efficiency was 90% that was the highest. 3) When the pitch was 250 mm and the feeding quantity was 70 kg/min, as the speed increased, the pressure on different parts of the blade increased, the power consumption increased, the productivity first increased and then decreased, and the transmission efficiency decreased. Consequently, for transporting agricultural fiber material, the optimum speed was 117 r/min. Under such condition, the average power was low, 354.63 W, and the transmission efficiency was high, 75%. 4) When the pitch was 250 mm and the speed was 117 r/min, with the increase of feeding quantity, the pressure on all parts of the blade increased, the transmission power and the productivity increased, and the transmission efficiency reduced. Therefore, the feeding quantity should be determined according to the requirement in practical work.