This book contains the problems and solutions of two contests: the Chinese National High School Competition from 198182 to 199293, and the Chinese Mathematical Olympiad from 198586 to 199293.China has an outstanding record in the International Mathematical Olympiad, and the book contains the problems which were used to identify the team candidates and select the Chinese teams. The problems are meticulously constructed, many with distinctive flavour. They come in all levels of difficulty, from the relatively basic to the most challenging.