The purpose of this study was to determine the effect of Creative Problem Solving (CPS) on Higher Level Thinking Skills of Grade XI students in High Schools in Linear Programs. This research was carried out in SMA Negeri 5 Palembang. This research method is quantitative with only a control group posttest design. Regarding the experimental class will be given with Creative Problem Solving while the control class will be given with cooperative learning. High-level Thinking Skills are postal measurements and data will be analyzed by t-test. The results of the study said higher-order thinking skills in the experimental class were higher than the control class. This means that CPS influences Higher Level Thinking Skills in Class XI of SMA Negeri 5 Palembang in linear programming.