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The purpose of this study was to determine the effect of Cooperative Learning learning models in Group Investigations (GI) and process science (KPS) skills on learning outcomes. The study was conducted in the even semester of the academic year 2018/2019, at the elementary school of the 2nd Christian Private Elementary School in Medan. The samples in this study were Class Va and Vb which amounted to 50 students, who were given learning using the Cooperative Learning method in the Type of Group Investigations (GI) and Science Process Skills (KPS). This type of research is quasi experiment because the class used has been formed before. The data analysis technique used is descriptive statistical analysis and inferential statistical analysis of Ancova with the help of the Mc program. Ecxel and SPSS 20. Based on the analysis and findings of researchers from the field some of the conclusions are the answers to the questions on the formulation of the problem, including the results of the average value obtained in the class that implements the model of high-GI l ore at 19.7% from the control class , F count > obtained from F table namely 5.9> 4.1 so that there is a significant difference between the results of learning style classroom use you learning models Cooperative Learning Group Type Investigations (GI) by using conventional models, obtained F count > from F table that is 6.02> 4.1 so that there is a significant difference in Style learning outcomes between students who have high Science Process Skills (KPS) and students who have low Science Process Skills (KPS), and it is found that the calculated value is 0.057> than 0.05 with a calculated F value of 3.029 so that there is no interaction between Science Process Skills (KPS) and Cooperative Learning Type Type Investigations (GI) Models