As civil aircraft was controlled by side stick, the control force of side stick has to satisfy the requirements of handle quality and airworthiness regulations, so it is necessary to measure the control force precisely. This article developed a control force measurement system based on the characteristic of side stick which can move in two degree of freedom and has complex surface. This system can control the movement direction of side stick to make the side stick be restricted in one plane, and make the force sensor vertical to axes of side stick to ensure the precise of measurement. This system also designed the software to show the curve of force, displacement and hysteresis based on LabView.