Corresponding target model was set up by selecting typical materials of small scale space debris in LEO.The velocity variation of the space debris ablated by high-power pulsed laser was analyzed and the orbital transfer model of small scale space debris irradiated by laser was built and studied,and the change rules of the orbital parameters of the space debris orbit under the irradiation of high-power pulsed laser were simulated and analyzed.The simulation results show that,the assumed space-based laser system can remove typical material debris successfully in one cycle of flight.It provides necessary theoretical basis for the further application of space debris removal by using space-based laser.