Wang yunfeng graduated from the mathematics department of Beijing normal university in 1983. He has studied in Nagoya University and Aichi University of Education in Japan. He is now the director of Changchun Foreign Languages School high school mathematics teaching and research office, special master tutor of mathematics college of Northeast Normal University, special-grade senior teacher. For more than 30 years, he has been devoted to the classroom teaching of high school mathematics and the study of the exam questions.