Objective: According to the statistics and regulatory inspection reports modification rate, incorporated in the hospital quality control target, together with the strictly control and management make the inspection results change rate up to the hospital quality management requirements.Methods: Counted up every kind of biochemical items which were monitored by machine 7180 in the biochemical laboratory from April to October 2013, and strengthen the inspectors sense of responsibility by the modification rate of timely rectification.Results: Every kind of biochemical items which were monitored by the machine 7180 including 62022 persons in the biochemical laboratory from April to October 2013, 896 persons inspection results were altered before printing ,which was 1.45 percent ;75 persons inspection results were altered by upper administrator after printing, which was 0.12 percent of the total and 8.37 percent of the altered people.Conclusion: Our inspection report modification rate decreased from 27.77 percent in April to 1.88 percent in October , the percentage decreased obviously.It proved that the PDCA model was successful in inspection report modification rate of Lis in our hospital, which achieved our quality management target.