Since the appearance of CubeSat standard in 1999 picosatellites have evolved a lot. Collage investigations are the main reason of that development. This works gives an answer to the propulsion problems of CubeSat satellites. In the next pages you can find a cold gas propulsion system concept based in butane for CubeSat applications. This concept take advantage of the butane qualities as propellant to develop a propulsion system light compact and enough capable to increase the mission duration remarkably.