Postgraduate Entrance Examination 660, the abbreviation of "Postgraduate Entrance Examination Mathematics 660", is a book for teaching postgraduate entrance examination mathematics. It means 660 math questions for postgraduate entrance examination.

Mathematics 660 for Postgraduate Entrance Examination is a book published by China Railway Publishing House in June 2008. The authors are Chen Wendeng and Chen Qihao. This book mainly tells about the problem-solving analysis of postgraduate mathematics, aiming at teaching students the methods and skills of problem-solving analysis.