This paper introduces the principle and characteristics of fuel cell

as well as its domestic and international technology status applied to aircraft power plant. Based on its characteristics

it analyzes the main problems that restrict its application

and prospects its future application. Although fuel cells have significant advantages such as cleanness

high efficiency

and low noise

they also have a series of shortcomings such as low power density

large weight

high cost

and limited technology maturity. Currently

they are only used in the field of drones. But even so

it is still a promising aeronautic power plant.