The Parent Teacher Association (PTA) is a volunteer organization that has a great influence on educational development. Many researchers are interested in its establishment and how it is involved in education, so there is a lot of scientific research on this topic. In the process of searching and classifying the studies on the PTA in the United State (US), the writer found that these studies are very diverse in approach to the issue, rich in content and have many valuable recommendations. This article focuses on clarifying research trends, research content and values of those studies by selecting information from website of the American Parents Association and analyzing 13 studies by 13 authors in different stages and regions