Thin films of lithium salt containing polymer composites were prepared from LiI, Li2SO4 and Li3PO4 with PEO, PVA and PEO-PVA (50:50) blends by solution casting method, for various salt concentration (10, 15, 20 mole %). The conductivity and dielectric measurements were carried out on these films as a function of frequency at various temperatures. The highest conductivity was observed in LiI-polymer composites. The variation of conductivity with salt concentration has been explained on the basis of percolation path. In the case of Li2SO4 and Li3PO4 composites, the variation of conductivity with salt composition is found to depend more on the nature of coordination of Lit ions in the composites rather than the mole % of salt itself. AC conductivity and dielectric relaxation behavior of these composites were also studied and the results are discussed.