A high-altitude long-endurance solar-powered UAVs has been identified to be an atmospheric satellite by the international aviation industry. Applying as a high-altitude long-endurance aerial vehicle, the solar-powered UAVs must compete with the balloons and the airships. In this thesis, we discuss the industry feasibility of developing a solar-powered UAV as a stratosphere long-endurance aerial vehicle. The fact that the propeller aircrafts are not suitable for the flight in the stratosphere should be considered, while the balloons and airships can naturally lift off by using the air buoyancy of their helium airbags. We shouldn’t use the weaknesses of the solar-powered UAVs to compete with the strengths of their rivals. By emphasizing the green-energy and long-endurance advantages of the solar-powered UAVs, the solar-powered UAVs can compete with fuel-powered or other electric UAVs. Besides, the solar-powered UAVs are suitable to perform the high-mobility missions because they are more flexible than the airships and balloons. Due to the advantages of the low-cost and flexible, a solar-powered UAV can be applied as a long-endurance aerial vehicle of the temporary high-altitude communication platform, or used to perform the periodic long-endurance monitoring in a certain region. By improving the flight performances, green energy, low cost, and high reliability, the solar-powered UAVs can win a favorable application market when they face the competitions of new long-endurance aerial vehicles.