Abstract: Seedling transplantation could make full use of heat resource，improve crop yields effectively and get excellent economic benefits，was a main development direction of vegetables industry in the future.Planting depth uniformity was a key index of machine quality inspection，which would infect immediately crops transplanting quality.Transplanting profiling had gotten extensive solicitude of transplanting machinery research in controlling planting depth effectively.Basic principles of several planting depth profiling control methods and existing representative models in developed countries were introduced，related researches of domestic research institutes were deeply discussed.Compared to analysis of each kind of profiling control method structural feature，deficiencies of domestic study in this field were summarized，and some suggestions for research and development direction of transplanter planting depth profiling control technology in the future were put forward.