Undergraduates in department of laboratory medicine were organized to participate in United Kingdom National External Quality Assessment Schemes. Case discussion was the main form and contents of cases cover the entire clinical biochemical field. One case was given every 20 days and undergraduates must answer in English. All answers would be summarized and reported by one of them. After results being returned， all undergraduates made a retrospective study. The highest score was 1.74 and the lowest score of -0.4， with the median score of 0.67. Time-window score ranged be-tween 0.98 and 0.41. After participating in the case discussion， students improved clinical problem-solving capa-bility， subjective initiative of clinical practice， English level and the team cooperation ability.