Pedals are the operating mechanism of the plane heading control. The pros and cons of ergonomic design, not only affect the manipulation of lower limbs driver accessibility and comfort, but also has certain security hidden danger of safe driving to the aircraft. By the study of human physiological characteristics and the biological mechanics, using the empirical formula, combined with the human body comfortable sitting posture simplified 2 d model and human body size, scope of lower limbs manipulation and the pedal travelling, were were analyzed and calculated theoretically, and the aircraft rudder pedal ergonomic design parameters were got. Being virtually simulating By the simulation software for ergonomics, the reasonable and available design parameters were finally achived. The research can provide theoretical support and method guidance for the conveyor pedals ergonomic design.