Unsafe behavior can pose significant risks to construction activities, leading to work accidents. In relation to the potential risk of occupational hazards during construction, knowledge of construction safety in construction projects has become a fundamental need. The safety aspect of construction will not be able to run as it should without intervention from management in the form of a planned effort to manage it called the Construction Safety Management System. The implementation of SMKK, according to Permen PUPR No. 10 of 2021, consists of five SMKK elements that become standards of security, safety, health, and sustainability. Based on this, the researcher of this study aims to determine the factors that influence the implementation of SMKK on worker behavior and determine the effect of SMKK implementation on worker behavior. This research is in Apartment Project X, West Jakarta. This research uses quantitative methods with multiple regression analysis to process the data from the questionnaire with the help of SPSS. The results of the application of SMKK in project X were obtained by means of questionnaires and interviews. It was found that using the five elements of SMKK has a positive and significant effect on how the project workers behave. This was shown by simultaneous hypothesis testing. Based on the results of partial hypothesis testing, it shows that the Construction Safety Operation element has the highest regression coefficient and has a significant effect. The implementation of SMKK on project X has been implemented well but not maximally. There are still many workers who behave unsafely (unsafe action), this happens due to the lack of awareness and knowledge of workers regarding the risk of danger. Therefore, the application of construction safety operation elements must be maximally improved.