Abstract: The effects of three dopants on electrical conductivity of doped Polyacetylene film have been studied, they show that the film doped with FeCl_3 or iodine give better electrical conductiviy than that with SnCl_4. The concentration of dopant in the sample will be affected by the concentration of the dopant solution on the one hand and by the thickness of the film on the other. The spread uniformity of the dopant in the film surface will vary with the doping time.