CubeSats have become an important point in space exploration with their small size and low cost. These satellites need propulsion systems to fulfill their missions in space and to change their position. CubeSats generally use chemical, electric and sustainable propulsion systems. This is a general short paper about propulsion systems of cubesats. In this paper, we will discuss kind of cubesat propulsion. In addition, in the conclusion we will talk about which propulsion systems are more appropriate to use.