In the New Era of Socialism with Chinese Characteristics, engineering college students face the practical needs of further improving their service will and capability. Selfcultivation can help this goal, because it has special advantages such as considering the student's internal world comprehensively, gradually cultivating moral qualities, and making students improve themselves as they wish, only if it is done faithfully and wholeheartedly. Therefore, based on practical experience, by integrating relevant theories and methods of the traditional Chinese culture excellence, Marxist philosophy, and psychology, we have established a modern methodology of the self-cultivation system for engineering college students, which taking a closed loop of self-perception and practice-testing as its core. This methodology starts from ideological concepts tested by long Chinese history, takes the improvement of physical, mental, academic, and social relations as the testing goal, and with method of guide-but-not-push, to promote the overall moral and humanistic quality of students. The application of this methodology has benefited both teachers and students, which will also expedite the creative transformation and innovative development of traditional Chinese culture excellence.