Abstract: The quality of books influence directly the prsition of book printing enterprices.The evaluation of the printing quality of books has been a difficult problem for a long time.In the past,people did this only by gualitative method in analysing and evaluating. Based on the summary of other methods and the using of grey theory, this paper has eslablished a CHARACTER MODEL GM(1,1) which can be popularized.With respect of the evaluation of quality,a guality control method by using conventional characters in put foreword.In the meantime,the possibility of forecast of grey model is applied.