In the information age, the answers-searching App is one of the emerging products which have great influence on students' learning. In recent years, many front-line teachers and college scholars have conducted extensive research on some problems of the Application of answers-searching App from different perspectives in theory and practice, and have obtained many research results. In order to better explore the Application of the answers-searching App in middle-school mathematics teaching, this paper reviews the existing relevant literature from the four aspects of the reasons and methods of using the answers-searching App, the influence of answers-searching App on students and its countermeasures. It is hoped that students can use the answers-searching App correctly in mathematics learning and promote the positive effect of the answers-searching App on mathematics learning.