Yin: Teacher of the Training Center of the High School Attached to the National People's Congress. Member of China Education Society and Middle School Mathematics Society. Senior math teacher in middle school, senior coach of China Mathematical Olympics. The students he taught won the first prize in the national mathematics competition, 6 students got full marks in mathematics in the college entrance examination, and 1 student won the top prize in the provincial college entrance examination. Participated in compiling the textbook of "New Curriculum Standard" of mathematics, and is a well-known national college entrance examination expert.