Group Project of Aircraft Design Abstract Military transport aircraft has an important status in the national defense.Considering the serious situation of the Nansha Islands on the south ocean,we decide to design an amphibious tactical transport aircraft to apply to the national defense of south ocean.In this report,we will specifically design the layout,payload,wing,fuselage,boat,landing gear,tail wing,and choose a suitable kind of engine,and most excellent materials to make our aircraft better.In addition,we will analyze different performances and constantly adjust the parameters in order to have a better performance.And of course,the life-cycle cost analysis is also an important process as we would like to have the best economics.At last,we will make a comparison with other similar aircraft and give the model of our aircraft.Group Project of Aircraft Design Abstract Military transport aircraft has an important status in the national defense. Considering the serious situation of the Nansha Islands on the south ocean, we decide to design an amphibious tactical transport aircraft to apply to the national defense of south ocean. In this report, we will specifically design the layout, payload, wing, fuselage, boat, landing gear, tail wing, and choose a suitable kind of engine, and most excellent materials to make our aircraft better. In addition, we will analyze different performances and constantly adjust the parameters in order to have a better performance. And of course, the life-cycle cost analysis is also an important process as we would like to have the best economics. At last, we will make a comparison with other similar aircraft and give the model of our aircraft