Objective:To observe the improvement of the serum SOD and MDA levels as well as the situation of the oxidation resistance by given puer-tea standardized Extracts (piece of puer-tea )in the middle aged and old population.Methods:80 people aged from 50 to 70 years old,who were given piece of puer-tea for 30 days,Before giving piece of puer-tea,after given piece of puer-tea 15 days,after given piece of puer-tea 30 days,serology analysis was separately performed.Results:After giving piece of puer-tea 15 days,SOD level was higher than that Before given piece of puer-tea,but MDA levels was lower than that Before given piece of puer-tea,but the differences were not significant（P＞005）.After given piece of puer-tea 30 days,SOD level was significantly higher than that Before giving piece of puer-tea,MDA were significantly lower than that bfore giving piece of puer-tea,the differences were significant（P＜005）.Conclusions:The piece of puer-tea can improve the function of oxidation resistance at middle aged and old population.