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The purpose of this study is to find out the improvement of critical thinking skills of students using Student Worksheets (LKS) assisted by computer simulation in learning. LKS used problem based and contains questions that explore critical thinking skills. This type of research is a quasi experiment with the design of two group pretest posttest. The population of this study is all students in class X Semester I SMA Negeri 9 Medan which consisted of seven classes totaling 243 students. The research sample was taken two classes determined by cluster random sampling technique, namely class X MIA two totaling 36 students as the experimental class using problem based LKS assisted by computer simulation and class X MIA three totaling 32 students as a control class with conventional learning. The instrument used for critical thinking tests was 10 questions in the form of problem based descriptions. Based on the results of different tests obtained significant differences in students critical thinking skills using problem-based LKS assisted by computer simulation. The percentage increases in N-gain critical thinking experimental class was 64% and the control class was 43%, each category was moderate.