Abstract: A lot of spacecrafts will be launched into space along with the development and progress of human space science.Because of lack of effective recovery means,more and more invalid spacecrafts abandoned will be accumulated in space with time increasing.No spacecraft could be launched into space if mitigation measures aren't adopted.The mitigation measures of satellites and launchers must be taken into account for protection of space environment and decrease of space debris.Some existing technology will be applied into debris mitigation.The strategy and range of space debris mitigation study will be presented.