The purpose of the present study is to identify the effect of forming small learning communities through Padlet in knowledge building and psychological and cognitive Engagement. Specifically, to discover the degree of continuity of the effect of forming small learning communities through Padlet in knowledge building and psychological and cognitive Engagement for University students, after a month from its application. And this study was applied to a sample consisting of (21) students studying the e-Learning diploma program at the College of Education at Princess Nourah University in Saudi Arabia with Average Age (22.38±1.06). The researcher used Knowledge building test and a Psychological and cognitive Engagement questionnaire. In the statistical analysis of the data, the researcher depended on Mean, standard deviation, Paired-samples t-test, effect size ([eta]2) The main findings of the present study indicated that there is a significant difference between the degrees of the experimental group in the Pre-test and Post-test of knowledge building and Psychological and cognitive Engagement for the Post-test that is proven statistically. In both the Post-test and Follow-Up tests of knowledge building and psychological and cognitive engagement, there was no statistically significant difference between the experimental group. Considering the theoretical framework and previous studies, our results were discussed and interpreted. In light of the study results, some educational recommendations and study suggestions were presented.