professor chen xulu is a great master of historical science,who is full of aca demic originality and radiant thoughts.h e has initiated a brandnew model in the research of china’s modern history.the two arguments that “china’s modern histo ry’s time limit is 110 years,all in all” and “modern chinese society advances in the way of superseding the old by the ne w”,put forward by him,have been generall y acknowledged in the field of historica l science home and overseas.this book,co mposed of 4 volumes,in about 1.8 million words is a galaxy of his works written in different times.this book also includ es his letters written in his later year s,which have described his life's journey.