Abstract: Color mixing activity by using an experimental method can develop the child’s cognitivie. In fact, the learning process in RA Hidayatul Islamiyah showel low cognitive ability, can be seen from mixing color activities, children in 4 year old can only mix one color which has been given by the teacher. Instructional media is provided but it less in using, and using the method in the learning process less effective. The subject of this study are all of children’s group A RA Hidayatul Islamiyah. The research used the method of a pre-experimental design with pre-test reseach design post-test design group given observation before treatment and after treatment. Data collection methods used were observation and documentation. Result the effectiveness of experimental methods of mixing colour in children’s cognitive development that has been done, showing that there is an increasing use of experimental methods by mixing the colors. Based on t test between before and after treatment can be seen there is an increasing use of experimental methods by mixing the color in the cognitive development of children’s. This is evidenced by t count bigger than t table at the 0,95 significance level (db) =23 at 1,71 and the value obtained is 21,11. It can be concluded that it significantly effictiveness through the use of experimental methods in mixing of colors children’s cognitive development is increase significantly.
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