In this paper, the measured results of the electric and optical performance of ITO, IOand TOfilms are given. These films are prepared on the substrates of flexible Kapton, Mylar and FEP Teflon by the magnetron sputtering. The tests indicate that their stabilities under various conditions are quite good. The conductivity of the antistatic films in the simulated substorm environment is also measured. The results show that the modified flexible SSMcan eliminate the charge accumulation on their surfaces and control the surface voltage below 80 Volt. On the contrary, the potential on the uncoated SSMsurface can have a value up to 8 -10 kV.