According to Gen. Hua Hsi-chun, director of the Chungshan Institute of Science and Technology's aviation development centre, to overcome the shortcomings of the IDF prototype, work has now started on an improved IDF model Ⅱ which is expected to have a maximum speed in excess of Mach 2 and which with its APG-67 firing control radar, the same model as the American-made F-20, will surpass the Jian 8 in combat capability.
中山科學院航空研究發展中心主任華錫鈞上將曾表示，為了克服 IDF 原型機的缺陷，已著手進行改良的 IDFⅡ 型，希望將空速達到二倍音速以上，加上與美製 F-20 同型的 APG-67 射控雷達，作戰能力應可超過殲八機種。