|This study evaluated the effect of circuit resistance training on 200-m front crawl swimmers. 12 male swimmers of the Kaohsiung County swimming team were selected as subjects. The intensity of 200-m front crawl swimming was estimated by testing blood lactate changes at the 1st , 3rd , 5th , 7th , 9th , 12th , 15th minute after the National Winter Short Course Championship. An 8-week circuit resistance-training model was designed according to the blood lactate changes after the competition. The blood lactate changes were measured at the 1st , 3rd , 5th , 7th , 9th , 12th , 15th minute after the National Spring Short Course Championship as the post-training data. The results were revealed as follows. First, the average blood lactate was 10.66±0.74 mmol•L-1, the peak volume appeared at the 1st minute after competition. Second, the post-training performance and the blood lactate improved significantly compared with the pre-training data (p<.05). Third, the maximum anaerobic capacity, the anaerobic ability and the fatigue index improved significantly after training (p<.05). Fourth, the blood lactate volume after the circuit training was 11.26±0.98 mmol•L-1, significantly higher than the pre-training volume (10.99±0.54mmol•L-1) (p<.05). We conclude that the intensity of this 8-week circuit training was similar to competitions. The blood lactate, performance, the maximum anaerobic capacity, the anaerobic ability and the fatigue index were significantly improved after the 8-week training. The result can serve as an index of training intensity.