This paper studies how to deal with an emergency procedure in the event of a certain engine failure in the process of take-off run and proposes an algorithm, i.e. an iteration searching algorithm to calculate the resume take-off decision velocity and programs the aircraft resume take-off decision velocity calculation. Furthermore, four kinds of resume take-off decision velocities of a certain aircraft are computed. The results indicate that the iteration searching algorithm is effective in calculating the resume take-off at decision velocity.