Abstract: This study aims to analyze the effect of work motivation, welfare, and work enthusiasm on work performance, both simultaneously and partially, and identify the most dominant variable in determining the work performance of members. The research location was conducted at Kodiklatau Halim Perdanakusuma Jakarta. This study uses a quantitative approach with descriptive analysis techniques and multiple linear regression to test the simultaneous and partial effects of the variables studied. The results showed that work motivation, welfare, and morale significantly influence the work performance of members simultaneously and partially. In particular, work motivation is the dominant factor influencing work performance, followed by welfare and morale. High work motivation, both from internal and external factors, is important in encouraging members to work harder and innovate. Guaranteed physical and psychological welfare also creates comfort and increases member commitment. High morale is also key in creating a dynamic work atmosphere, motivating members to contribute more optimally. This research provides practical insights for Kodiklatau Halim Perdanakusuma Jakarta in improving work performance by focusing on factors that optimally influence motivation and member welfare.