The grey mullet have been regarded as the treasure, so it is the very precious fishery resource in Taiwan. However, from the historic catches, it showed the amount of the grey mullet is decreasing every year and the reasons are not only influenced by the climate change, but also the catches from the vessels of PRC. The main purpose of the study is the effects of the implementation on individual transferable quota of the cross-strait in grey mullet to the living of fishers in Taiwan. Through the management of quota, it would prevent the phenomenon of biological overfishing and economic overfishing, and achieve the sustainable development of fishery resources. The article is to study about the effect of the restrictions on the purchase of unit quota and different quota ceiling to the both of buyers and sellers. The results showed that when the restrictions on the purchase of the unit quota, this would may have the amount of vessels cut to the half and prevent the economic overfishing. Because of quota trading, this will make the fishers are willing to exit the fishery and to achieve the purpose of the management of ITQ.