The structures of photonic crystal fibers(PCFs) are changed by means of adjusting the size and pitch of air-hole.The monomer polymerization method is adopted based on methyl methacrylate(MMA).And the two kinds of PCFs preform with different polarization maintaining(PM)degree are developed.And further,the samples with different parameter structure are developed via using second stack draw.Finally,the optical properties and PM characteristics of two samples are studied.The optimize scheme of PM-PCFs with elliptical core is prouded experimentally.