Whether the second degree of China Southern Airlines is useful or not, there is no official statement. However, according to the network news, China Southern Airlines can obtain a self-taught undergraduate diploma and a bachelor's degree certificate after graduating from the second degree. Compared with the ordinary undergraduate diploma, this certificate has the same legal effect, and can be used for employment, salary increase, promotion, postgraduate entrance examination, examination of civil servants and so on. The specific use depends on individual circumstances. The second degree of China Southern Airlines is a service provided by China Southern Airlines for ordinary higher education students, aiming at giving full play to the service function of higher education self-study examination, cultivating compound talents and improving the employability of college students.