For example, the correct use of praise and criticism of teachers' correct evaluation, appropriate encouragement, can stimulate students' self-improvement and self-esteem, and improve students' learning motivation. In teaching, we take more praise encourage, less criticism, do not hit the way, most students in the classroom have the opportunity to speak. Skillfully set exercises before class, good, middle and poor students with difficult and easy different exercises, so that every student can do the problem. When they achieve success and make small progress, we give them timely praise and encouragement. When they see the teacher's encouraging eyes, hear the teacher's praise language, the children's faces show a sweet smile