In the study of modern business management, the importance of employees is being mentioned more and more. Employee satisfaction is also being emphasized as an important factor affecting the long-term development of enterprises. This paper summarizes and discusses the effects of organizational and individual level factors on employee job satisfaction, which have been frequently discussed in previous literature, by means of a literature review. It has the significance of summarizing. After discussing, the paper concludes that organizational environment, salary and benefits, career planning and leadership style are positively related to employee satisfaction. At the individual level, age, education level and work experience are mainly studied, and due to the different characteristics of the studied industries, different scholars have come up with various conclusions. Based on the discussion of these factors, this paper further provides suggestions that can be implemented by organizations to improve employee job satisfaction. For example, shortening the power distance, establishing a mentor system, and conducting frequent meetings to ensure that the different needs of employees are heard and so on.