The purpose of this study was to investigate the sensitivity of a self devised martial arts training implement to test whether the implement would work or not in detecting the foremost response time when contestants participated in karate fighting. 14 karate contestant subjects from Chang Gung University school team were recruited, The mean age of the subjects were 21.07±1.59years old, height 165,50±9.61 cm, weight 59,86±9.48kg and experience in learning karate was 1.93±1.07years, The ratio of subject's height was the element in determining the hitting target distance. They were required to hit 12 targets for scored marks. A light indicator was used to let the subjects know when they should hit the target. They needed to hit the target 22 times. The foremost response time was recorded using a stopwatch, The entire test was carried out for a week. The eighth day was defined as the pretest day. After the pretest day, the same training program was carried out for the following 5 days. The 14th day was recorded as posttest day. At this time the subjects were tested again for foremost response time. The data were collected both at pretest and posttest. The results were as follows: the performance of the foremost response time and the accuracy in hitting the target of a karate contestant that had trained using the self devised martial arts training implement was significantly increased. The purpose of this study was to develop a set of martial arts training implements that would be suitable for martial arts training. We hope it's helpful in detecting the foremost response time of the karate contestant, in the meanwhile, we also hope this self devised martial arts implement can help the karate contestant in the foremost response time. Furthermore, these preliminary results are encouraging and may justify further investigation. Finally, we hope this study material can provide the reader with useful information and be used as an effective reference for martial arts hitting time response.