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A new online optimization method of Terminal Energy Management Technology for Suborbital Launch Vehicle was discussed in this paper. First of All, the math model of SLV was presented; base on the aero characteristics of Vehicle and the ability of control system, the method of online programming for voyage was developed. The altitude of Vehicle varying with the voyage was programmed which transform the question of energy programming into velocity programming. Then a simplex method was introduced to solve the specification optimization problem to satisfy the terminal and process restrictions. Above it the real-time reference trajectory can be generalized. Then a fuzzy guidance algorithm base on reference trajectory was developed. The final simulation shows that this method has good guidance precision and robustness. The variety of initialize position, wind and other disturbance can been accepted and the errors of velocity and altitude was less than 3%.