In order to solve the problem that the aero-gas turbine may cost too long time when starting on plateau ground, adjustment schemes were searched to shorten the starting time based on theory analysis. And then an engine-starting experiment was carried out on a plateau airport. To test the feasibility of adjustment schemes and further to get the optimal one, the scheme of oxygen supply was used in the experiment and the scheme of hydraulic load control was used on the base of the first scheme. After theory analysis and experimental investigation, a synthesized adjustment scheme, oxygen supply at the beginning of engine start together with hydraulic load control during engine start, was got. The results do show that the adjustment scheme can improve the residual power of the engine at the beginning of starting and shorten the starting time about 18%. The maximum discharge temperature during starting is reduced a little. Therefore, the adjustment scheme can improve the engine-starting performance on plateau ground effectively.