This research aims to determine effectiveness of the use of media based learning student blogs to learn independence on economic subjects in class X SMK Negeri 3 Pontianak. The research method used was experimental pretend (quasy experiment) , with the design of the study is a nonequivalent control group design. The study sample is 82 students in the experimental class of 40 students and grade control as many as 42 students. The results of data analysis in the form of a questionnaire showed that independent learning (1) The results of the inquiry before using a blog -based learning media obtained the average score was 67.38,by percentage of indicator namely : the first indicator to 45.76 % , the second indicator 64.41 % and the third indicator to 57.85 %. (2) The results of the questionnaire after using a blog based learning media obtained an average score of 63.18, by percentage of indicator namely : the first indicator amounted to 82.85 % , the second indicator amounting to 67.72 % and the third indicator amounted to 75.32. the results of effect size of 0.4373 , then based on the applicable criteria including the value of the effect size in the medium category