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The goal of this research was to know the gain of student achievement that taught by using dubido. The research has been done in Chemistry Educational Study Program in Unimed. The experimental class was given treatment with teaching by using dubido media based on contextual. The experimental class has fulfilled the requirement for normality and homogenity test. The mean of pretest results and posttest results were 36.615 and 82.769. The increase of posttest results indicated that learning by using dubido based on contextual can improve students achievement. The increase of students achievement signed by percent of gain with the value of gain percent was 74. The result of t test was obtained from tcount is more than t table (2.038 is more than 1.671) at a is 0.05, it means that the implementation of dubido based on contextual was given positive effect to increase students achievement.