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An onboard trajectory planning algorithm is presented in this paper for the terminal area energy management (TAEM) phase of a reusable launch vehicle (RLV).To satisfy the multiple constraints in the TAEM phase,a profile in the flight-path angle vs.range-to-go space is planned.The optimization of this flight-path angle profile is described as a one-parameter search problem and solved by the Newton iteration method.With the optimized flight-path angle profile,a satisfied longitudinal flight trajectory is generated based on the flight dynamics.Testing for the trajectory planning algorithm is performed in missions with different terminal flight-path angle constraints.The onboard algorithm is indicated effective to generate a constrained longitudinal flight trajectory in 0.5 seconds on a PC.The Monte Carlo simulations are employed in dispersed cases,and the planning algorithm is shown robust in trajectory generation with large initial condition errors of the TAEM phase.