1. Different identities: the students in the middle and young classes belong to political education or business training, and they are all political work officers or business backbones. The "four types" of cadres are non-party cadres, young cadres, ethnic minority cadres and women cadres.

2. Different cultivation methods. Young and middle-aged classes focus on business skills learning, and the training methods are all new technologies and new processes. Four-class cadre training courses are to strengthen practical training, hold training courses for young and middle-aged cadres continuously, and send outstanding young and middle-aged cadres to the Party School of the Municipal Party Committee for off-the-job training, taking training as an important means for "four-class cadres" to broaden their horizons and improve their quality.