The background of this study is that the use of Google Classroom in elementary school spoon II Bojonegoro is considered less effective e. This study aims to determine: 1) the development process of teaching materials based on LMS "Sifajargoro"; 2) the feasibility of teaching materials in terms of practical aspects, valid and effective. This type of research is the ADDIE development mod l. The subjects of this study were sixth-grade students of State Elementary School Sudu II-Bojonegoro academic year 2021/2022, totaling 18 children. Data were collected through validation instruments, written tests, and questionnaires. The results obtained: 1) process of developing teaching materials based on LMS "Sifajargoro" using ADDIE development model through 5 stages, namely: analysis, design, development, implementation, and evaluation n. 2) LMS-based teaching materials product "Sifajargoro" is said to be suitable for use as a medium of learning in terms of 3 aspects, namely: the validity aspect obtained from the validation results with an average score of 84.21% included in the valid criteria, the effectiveness aspect in terms of test questions obtained the percentage of students who complete is 70%, so it is said to be effective, and the practical aspect in terms of the questionnaire and the overall average percentage result is 73.97%, so it is included in the practical criteria. So that from the results of development can significantly improve student learning outcomes.