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Background : The purpose of this study was to examine the effect of balance ex ercise and plyometric exercise on fuctional ankle instability. Methods : Followed by an ankle instability questionnaire, 25 adults in their 20's were surveyed regarding ankle sprain experience of which, 18 subjects were rando mly assigned into balance exercise group(BEG,n=9) and complex exercise group(C EG,n=9). The degree of ankle instability of each group was determined by the CAI T, The digital inclinometer was also used to measure the ROM of ankle plantar fl exion and dorsiflexion. Static balance ability, dynamic balance ability were measure d using-Biorescue-equipment to evaluate balance ability. Participant's balance left to right and front to back were measured by static plantar pressure and the follo wing results were obtained. Results : To justify its significance, the standard of ankle instability of each contr ol groups were set at less than CAIT 24 points and results showed both groups h ad a statistically significant difference(p<.05). It was also evident the ROM showe d a significant difference in the dorsiflexion of the BEG(p<.05). Furthermore, by c omparing the difference between static balance and dynamic balance, results showe d there was a significant different between Romberg velocity and limit of stability area in CEG and Romberg velocity in BEG(p<.05). Lastly, there was significant di fference in BEG's area between front to back(p<.05). Conclusion : By the mentioned results, it was concluded there were some signific ant effects on the ankle instability, ROM, balance ability and partial plantar pressu re between the balance exercise group and plyometric exercise group.