The goal of Takeoff Monitoring System for flight test is to foresee risks in advance and take measures. During flight tests, pilots are responsible for performing a wide range of flight maneuvers to assess the aircraft's maneuverability. In order to ensuring flight test safety, it is necessary to predict various aspects of aircraft takeoff performance before actual flight tests. Takeoff Monitoring System for flight test is designed to display the current position and states of the aircraft, and to calculate the remaining length of the runway based on the requirements of flight tasks.