The International Mathematical Olympiad (IMO) is a competition for high school students. China has taken part in IMO twenty times since 1985 and has won the top ranking for countries thirteen times, with a multitude of golds for individual students. The 6 students China sent every year were selected from 20 to 30 students among approximately 130 students who take part in the China Mathematical Competition during the winter months. This volume comprises a collection of original problems with solutions that China used to train their Olympiad team in the years from 2003 to 2006.Contents:2002-2005 China Mathematical Competition2002-2005 China Mathematical Competition (Extra Tests)2003-2006 China Mathematical Olympiad2002-2005 China Girls' Mathematical Olympiad2002-2005 China Western Mathematical Olympiad2003-2006 International Mathematical OlympiadReadership: Researchers, educators, lecturers, and students interested in mathematics and education.