Colleges and universities carry the mission of servicing the national policy needs and the development of the national economy, training and projecting high-level talents in various fields. The training of talents in colleges and universities is very important, and the quality of the enrollment source has an important influence on the training of talents, and it is related to the goal and quality of talent training. In recent years, with the reform of the new college entrance examination, colleges and universities have faced great challenges and opportunities for undergraduate enrollment. This article takes the aerospace undergraduate source of Northwestern Polytechnical University as the research object, combines the school's admission policy and admission data in recent years, analyzes the factors influencing the quality of the school's aerospace student source from the three aspects of school propaganda, social practice, and local policy. According to data analysis, it is found that vigorously carrying out high-quality enrollment publicity is its principal influence factor, and applicable countermeasures are put forward around the enrollment publicity work.