The purposes of the research were to 1) Develop online lesson with Collaborative Learning of LT Techniques in Thai language for students 9 Anubanbangsaphannoi School 2) find the efficiency of online lesson with Collaborative Learning of LT Techniques developed. 3) compare the learning achievement before and after learning with online lesson with Collaborative Learning of LT Techniques developed. 4) study students satisfaction towards learning with the online lesson developed. The sample user in this research ware 23 students, 9 Aubanbangsaphannoi School Using a simple random selection method. The research instruments were online lesson, management learning plan, Pre-test, Post-test and satisfaction questionnaire. The statistics used in data analysis were mean, standard deviation, t-test.

            The research findings showed that 1) Developing online lessons using Collaborative Learning of LT Techniques in Thai language the results of the assessment found that the content suitability was at the highest level, ( = 4.80, S.D. = 0.41) and the suitability in the media production technique is at the very level, ( = 4.24, S.D. = 0.71)   2) Results of a study on the effectiveness of developed online lessons was found to be equal to 80.58/80.29 which was highest than the standard criteria of 80/80. 3) Academic achievement of students taking online lessons it was found that there were scores after studying ( = 24.09, S.D. = 2.37)  higher than before ( = 13.96, S.D. = 3.42)  the statistical significant level of .05 4) The results of the questionnaire on the satisfaction of students with online lessons. found to be at the very level ( = 4.40, S.D. = 0.04)