Abstract: Objective: To analyze and summarize the Results of ministry of health External Quality Assessment( EQA) for clinical chemistry laboratory of General Hospital of Wanbei Coal-electricity Group from 2008 to 2012， and to improve continuously the quality of clinical laboratory work and provide the better clinical service. Methods: According to the unified evaluation criteria of NCCL， the EQAResults of clinical chemistry laboratory were statistically analyzed using proficiency testing and variability index score( VIS) from 2008 to 2012. Results: From 2008 to 2012， the 5 years average qualified rate of proficiency testing was 98. 7%. VIS average score dropped from 53. 4 to 30. 2， the excellent，qualified and unqualified rates of VIS score were 85. 6%， 10. 1% and 4. 3%， respectively. Conclusions:The EQA analysis can improve the analysis capabilities of internal quality control and the examination quality， and provide the accurate basis for clinical diagnosis， therapy and prognosis.