Abstract: The low altitude polar orbit satellite has the advantages of short orbital period and high resolution observation on the ground. However, the high atmosphere drag force shortens its orbital life, which restricts its applications. In this paper, we propose to increase the low polar satellite's orbital lifetime by using a horizontal direction electrodynamic tether. We analyze the possibility of its application in low polar orbit satellites with different sizes at three typical altitudes (160 km, 400 km and 800 km). The magnetic field strength, the electron density and the atmosphere density are calculated by tracking the satellite's motion. By comparing the tether's Lorenz forces and the satellite's atmospheric drag forces, it is shown that the horizontal direction electrodynamic tether can increase the orbital lifetime for low polar orbit satellites within a limit of the tether length, the orbit altitude and the satellite's size, and is especially suitable for large satellites at the altitude above 400 km.