<p class="Sammary"><em>Creative thinking </em><em>ability is the </em><em>one of important things</em><em> in mathematics lesson</em><em>. In developing</em><em> such creative thinking ability</em><em>, teachers must be good at giving ideas and issues which </em><em>are relatively different from before,</em><em> s</em><em>o that we can find</em><em> something new. T</em><em>he authors formulate the problem: Do</em><em> the creative thinking abilities of students who received Creative Problem Solving learning</em><em> better than students who received conventional learning?Quasi-experimental research with experimental design (Nonequivalent group pretest-posttest design) aims to determine students' achievement of creative thinking abilities through Creative Problem Solving. The benefits of this research are expected to improve the students' creative thinking ability</em><em> through CPS further in</em><em> SMPN 2 South Tarogong. The instrument used in this study is a written test form with a description of the subject lines and angles. The population was all students of class VIII SMPN 2 South Tarogong;</em><em> the</em><em> sample of the selected class is </em><em>VII-D</em><em> and VII-E </em><em>class. From the analysis of data normality test results of initial tests, obtained a score in the experimental class wa</em><em>s not normal, so the test followed by Mann Whitney test, </em><em>the gain wa</em><em>s normalized. These results indicate that: (1) The improvement</em><em> of </em><em>students’</em><em> creative thinking ability </em><em>who received</em><em> Creative Problem Solving learning</em><em> better than students who received conventional learning, (2) The i</em><em>mprovement of students’</em><em> creative thinking ability</em><em> who received</em><em> Creative Problem Solving learning</em><em> included into the high </em><em>category, (3) The students’</em><em> attitude of the experiment class on the </em><em>subjects of mathematics and Creative Problem Solving learning</em><em> wa</em><em>s dominated by a positive attitude.</em></p><p class="Sammary"><em> </em></p>Keywords: <strong>Creative </strong><strong>thinking ability, Creative Problem Solving, conventional, experimental methods</strong>.