An epoxy-based precursor polymer was prepared from the diglycidyl ether of Bisphenol A and aniline．The precursor polymer was doped with a certain amount of cross-linking agent M2OS to obtain a thermal-curable polymeric system BPAN+M2OS．The thermal curing behavior of BPAN+M2OS was studied by means of in-situ infrared spectroscopy and it was found that BPAN+M2OS showed significant thermal-curability and had the similar curing dynamics at both 120℃ and 180℃．The curing degree can reach 70.7％ at 120℃ and 8l.8％ at 180℃ within 20 min

respectively．When a two-layer film was prepared with the cured polymer BPAN+M2OS as the bottom cladding and an E．O．polymer BPAN-1A-NT as the upper layer

SEM studies showed a perfect interface between the bottom and the upper layers of the two-layer film and the surface of the upper layer was quite smooth．A polymeric planar prototype waveguide

which was fabricated based on the above two-layer film and covered by another layer of UV photoresist

showed good wave-guide performance．