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This research aims to 1) study the effectiveness of the students- critical thinking through the web-based learning on the criteria of 80/80 2) compare the pre-test and post-test scores of the students- achievement of the critical thinking through the web-based learning, and 3) study the students- satisfaction of the study through the web-based learning. The sample was drawn from cluster (area) sampling were 115 of grade 3 students studying at Banlanwittayakom school, Khon Kaen province, Thailand. In the 1st semester of the academic year 2019. Data were analyzed by using simple statistic models and t-test. The results were shown in the following. 1) The effectiveness of critical thinking through the web-based learning of being ashamed of sin content in the Buddhism subject has met the criteria of 80/80. That is the effectiveness of the critical thinking contains 82.07/82.01 which means that the web-based learning designed is efficient and appropriate to be used in the learning process of the be ashamed of sin content. 2) The post-test scores showing the success of the students- critical thinking through web-based learning, be ashamed of sin content, was significantly higher than the pre-test scores at the .05 level of significance. 3) The students satisfaction of the web-based learning contains a high level of satisfaction on the content (3.52), whereas all of the remaining satisfaction on the design, the presentation, and the advantages contains the highest level of satisfaction (3.42, 3.52, and 3.67 respectively).