The purposes of this research were to develop the online lessons using Peer teaching techniques on the safe use of computers and protection of personal information for Grade 5 Students at Suphanphum School. The organizing team had the seen on the online learning at the present that might result in not being able to fully learning. This article, therefore, proposed a solution to develop the online lessons to be more effective. moreover, peer-to-peer techniques had also been used to help increasing the students' learning efficiency. The target group that the organizing committee had chosen to study were Grade 5 students at Suphanphum School. The content used in the development was Computing Science using peer teaching techniques. The organizer had designed the pre-tests and post-tests to measure the efficiency of the improved lessons on the target group. The used exam had 30 questions and consisted of the contents on Using computers safely, Technology Etiquette, Searching for knowledge, and Evaluating the credibility