The new curriculum standard clearly points out that "helping students explore their own development direction in learning" and "actively advocating independent, cooperative and inquiry learning methods". Modern educational psychology also tells us that "all educational methods must be based on mobilizing students' initiative and enthusiasm for learning, so that students have sufficient motivation to study actively and willingly." "Active learning" is not only a learning attitude, but also a learning method and habit, and it is also a teaching model and teaching strategy. Under the background of the new curriculum reform, students are required to fully participate in efficient classrooms, cultivate their innovative spirit and creativity, and finally learn to actively build their own knowledge and ability system, and finally improve learning efficiency. The author talks about some humble opinions on how to build an active, lively, happy, effective and efficient classroom. Primary school students are in the transition stage from thinking in images to thinking in abstract logic, which is the best opportunity to educate them in mathematics. For them, they are eager to learn knowledge, but because of their young age, unstable attention and weak willpower, their learning is obviously affected by emotions. They often know things by interest and are easily attracted by interesting and novel content. Those who are interested will be absorbed, and those who are not interested will be absent-minded. Therefore, I think whether any teaching mode can stimulate students' interest in learning is the key. When students are interested, they will take the initiative to participate, and the classroom will naturally be lively, happy and effective. First, let students like you, so as to enjoy your class. Nowadays, many teachers ignore personal charm and quality requirements when thinking about how to make students learn mathematics well and how to stimulate students' interest in learning. Gorky said: "whoever loves children will love them, and only those who love children will educate them." "As far as teachers are concerned, we should improve ourselves from all aspects, such as the cultivation of teachers' morality, so that students can respect you from the heart and make them like you more and the subjects you teach more. For example, children often say that they like to eat mom's (dad's) cooking, not necessarily because mom's (dad's) cooking is delicious, but because mom's (dad's) is their favorite person. So most students are looking forward to communicating with their favorite teachers in class. In the eyes of students, teachers are the embodiment of noble personality, and the image of teachers directly affects the cultivation of students' healthy mind and sound personality. Teachers' appearance and demeanor, knowledge and talent, personality and accomplishment are often important factors to attract students. Clean appearance, dignified and generous surface factors are prerequisites. At the same time, due to the improvement of material life and the increasing competition for knowledge, students admire teachers' wisdom more and more, and students prefer "good at communication" and "friendly" teachers. In addition, teachers' healthy personality, extensive interests, strong will, cheerful personality, peaceful mentality and healthy emotional formation will undoubtedly become the charm of teachers to attract students. Only by constantly improving themselves and enhancing their image charm can teachers attract and influence students with irresistible force. Only teachers with extensive knowledge, superb teaching art, excellent basic teaching skills, good psychological quality, positive health and emotion can infect students with their own personality and realize emotional education. Second, create a happy and harmonious classroom environment for students and let them enjoy it. Education and teaching is an interactive process of psychological communication and influence between teachers and students, which is completed under the interaction and mutual restriction of knowledge and emotion. Emotional communication in classroom teaching should be more important than knowledge communication, and it is impossible to achieve ideal teaching effect by focusing only on knowledge explanation and ignoring emotional communication. This kind of emotional communication between teachers and students and the democratic and equal relationship between teachers and students are the basis for forming a happy and harmonious classroom environment. 1. Bring a smile into the classroom. " Smiling is the need of teachers' profession. " The teacher walks onto the platform, just like an actor walks into the studio, and should immediately enter the role. No matter what happens in life, this emotion should not be transmitted to students. This high degree of control comes from good psychological cultivation and noble professional ethics. Teachers' smiling faces, caressing eyes and elegant appearance set a happy and peaceful tone for the class and created a good psychological environment for students' study. 2. Establish relaxed and harmonious bilateral activities between teachers and students. In the classroom, the bilateral activities between teachers and students are relaxed and harmonious, and teachers and students show their true selves. In class, students sometimes whisper, sometimes discuss in a low voice, sometimes argue loudly and compete to speak. In response to the students' unique speeches, the teacher nodded in agreement from time to time. For students with poor expressive ability, teachers activate students' thinking with trusting and encouraging eyes and words. Encourage students' performance in class, supplemented by appropriate praise. Encouraging evaluation and praise can make students dare to think, ask, say and do like spring breeze. Only in this way can classroom teaching be full of vitality, students' personality can be fully displayed, and students' creativity and innovation sparks can be generated. For example, in practice, students finish the homework assigned by the teacher within the specified time, and the teacher rewards "small prizes", mainly for students with learning difficulties, and sometimes they will take the initiative to whisper to them. When students are rewarded by teachers, their enthusiasm for participating in learning will be higher, and they will further discover problems and exert their imagination, so as to get rid of the troubles of studying hard and enter the realm of happy learning. Let the students feel: "I am in charge of my class, I am confident, I am happy, I am healthy, I am happy!" " "Classroom teaching should be the true expression of happy feelings. In this class, learning is no longer a burden, but a pleasure. Students inspire, encourage and improve each other. There is no sarcasm here, only encouragement; No discrimination, only respect; There is no corporal punishment, only tolerance; There is no storm, only a gentle breeze and drizzle. Strive to put people first and care for life into detail. Blackboards, walls and campuses are full of students' "famous sayings", which are their own feelings and experiences and the true expression of their hearts. In this class, students' activities and activities are out of their own initiative, spontaneity and consciousness. Just like playing basketball, they may be full of sweat, but they enjoy it heartily. This is by no means a heavy burden, but the enjoyment of life. Classroom teaching should be a harmonious and efficient classroom. In this class, students study easily and happily, learn to respect, learn to be confident, learn to be a man, develop good habits and cultivate a sound personality. In this class, students internalize knowledge into strength and experience into generation and innovation. This kind of classroom will be the goal of our curriculum reform, and achieving this effect will also be the goal that all of us must pursue.