不同地区、不同时期的食品监测合格率应标化后才能比较评价［１］。但在计算食品监测标化合格率时，多数研究［２４］只考虑了食品种类构成这一因素。事实上，１９９７年以前统计报告的食品监测合格率标化因素有三个［５］，即季度、食品种类及抽检和送检。我们利用１９８６ Different regions, different periods of food monitoring pass rate should be standardized in order to compare evaluation [1]. However, when calculating the pass rate of food monitoring standardization, most studies [2  4] only consider the composition of food species this factor. In fact, there are three standardization factors for passing the food inspection by 1997 [5], that is, the quarter, the type of food, sampling and submission. We use 1986