The purpose of this study was to compare the effect of range of motion (ROM) duration static and the active isolated stretching in the hip joint of athletes. Eighteen subjects (11 male, 7 female) with a mean age of 21.16 yrs volunteered from the Hsuan Chuang University martial arts team. The volunteers were randomly placed into 3 separate groups; the first group (6 people) was assigned to active isolated stretching (AIS), the second group (6 people) were given static stretches (SS), the third group of 6 was a control group. The first two groups performed a stretching routine 5 times/wk for 6 weeks. During this period the control group did not do any stretching. After the 6 weeks, the sit-and-reach test, the active leg raise test and the passive leg raise test were used to measure the ROM of the hip. Data was analyzed utilizing an ANOVA model. Result were analyzed utilizing Scheffe’s post hoc Significant Difference test. The level significance for all testing was α=0.05. The results showed that the active leg raise test was significant different between the AIS group (p<0.05). The passive leg raise test showed a significant difference between the AIS group, the SS group and the control group (p<0.01). In conclusion, the AIS is better than SS for improving the flexibility of the hip joint in Chinese martial arts athletes.