Zhang Xiaoying, a mathematics teacher of special grade, was awarded the teacher of special grade in 1999. She was born in April, 1962 and graduated from the Department of Mathematics in Northeast Normal University with a bachelor's degree in1984. She has been working on teaching high school students during the past 30 years. She has been the class adviser of Dragon Experimental Class in Tsinghua University High School for years. She has worked on Mathematics teaching, tutoring competitions and management of students. The students tutored by her have won the first prizes for many times in national and Beijing municipal competitions and all her classes are awarded as Beijing Outstanding Class. Her papers on education and teaching have been widely published and her open classes have been awarded. She has been awarded as Advanced Worker of Tsinghua University, Beijing Zijin Cup Outstanding Class Adviser and March 8th Red-Banner Holder of Haidian District. She is the current director of Senior 3 in Tsinghua University High School.