Abstract: Objective To ensure the service quality, period checking of the laboratory for occupational health was implemented and the related data were evaluated. Methods Based on the Guidance on Statistic Treatment of Proficiency Testing Results and Performance Evaluation(CNAS-GL02:2014)and the Guidance for Measurement Uncertainty Evaluation Based on Quality Control Data in Environmental Testing (CNAS-GL34:2013),the period checking of the rapid detection instruments for emergency which was used very seldom and the typical parameters of reference materials was done. Then the available data were analyzed. Results The portable IR gas analyzer and multiple gas detectors were in order since last metrological verification. The typical parameters of reference materials, ammonia-nitrogen and mercury had no difference with the standard values. Conclusion Period checking of the laboratory can show the real condition of laboratory running. This work provides the objective evidence to maintain the laboratory with good reliability and applicability.