In recent years，the total number of college graduates in China has constantly created the historical record and the growth rate has significantly accelerated. In addition，under the impact of the COVID-19，the global economic growth is sluggish and the domestic economy has obviously experienced downward pressure，which has led to unprecedented challenges for college students’ employment. In order to actively respond to the “difficult employment” of college students，this report uses survey data to make a longitudinal comparative analysis of the new features，new trends and the impact of the epidemic on college students’ employment ideology and employment status in 2018-2021. The research finds that：（1）College students’ job selection reflects strong preference within the system，and this preference shows a trend of strengthening year by year. The proportion of college students who choose to work in small and medium-sized cities，small counties，villages and rural areas is also increasing；（2）The employment mentality of college students is generally optimistic，and their employment confidence is sufficient. Although the confidence has been weakened after the COVID-19，the confidence level rebounds very quickly；（3）The employment rate of 2018-2021 college graduates has not changed much in general. After the epidemic，there has been a small decline，but the overall situation is stable. The employment of college graduates showed obvious changes，and the proportion continuing education among higher vocational schools and prominent colleges increased significantly after the epidemic. （4）The income of 2018-2021 college graduates showed an overall growth trend，but the growth rate decreased after the epidemic. After the epidemic，college students’ job satisfaction decreased significantly；（5）The continuous impact of the epidemic，combined with the impact of the external environment，reduced the employment stability of the 2018-2021 college graduates，and the concern about unemployment spread very quickly. In order to improve the employment quality of college students，this report puts forward corresponding countermeasures and suggestions，such as promoting policy support，improving students service，enhancing positive mentality，designing detailed measures，and strengthening social security.