In order to investigate the feasibility of serum creatine kinase (CK) and blood urea nitrogen (BUN) in monitoring pre-competition training of badminton athletes, the pre-competition training load of 20 badminton athletes was studied, and serum CK and BUN were determined before, immediate and next ming after training. The results showed that after intensive training for one week, serum CK levels were significantly increased by 57.53 mmol/L (P＜0.05). After regulation of the training intensity, average serum CK levels were increased by 21.79 mmol/L (P＜0.05). BUN contents were increased by 0.83 mmol/L on average with the difference being not significant (P＞0.05). After intermittent training, there was significant difference in the average increased levels of serum CK in athletes (P＜0.05). There was significant difference before and after regulation of training (P＜0.05). The increased levels of BUN were 0.78 mmol/L without significant difference (P＞0.05). It was concluded that serum CK was one of the biochemical indicators monitoring the training load sensitivity of badminton athletes, but BUN was of little value in monitoring the training load. Both serum CK and BUN recovered slowly after one-week intensive training and intermittent training, suggesting the metabolic mechanism of human body in training needs further study.