Two new polytriazines：poly [2-methyl-4，6-(4’，4”-diphenylene)-1，3，5-triazine] (I) dan poly [2-phenyl-4，6-(4’，4”—diphenylene)-1，3，5-triazine] (II) were synthesized from the solution condensation of biphenyl-4．4’-diamidine dihydrochloride with acetic anhydride and biphenyl-4．4’-diamidine with benzaldehyde respectively．These two polymers were characterized by TGA，DTA，elemental analysis and IR spectroscopy．They exhibRed good thermal oxidative stability as shown by the fact that the powders of these polymers suf-fered 5.4％．2.4％ weight loss after isothermal aging in air at 300℃ for 200 hours. The decomposition temperature of (II) was 583℃ in air and 590℃ in N2．In comparison，the linear poly．1，3，5-triazine as mentioned above were soluble in concentrated sulfuric acid，phosphoric acid and trifluoroacetic acid whereas the crosslinked poly-1，3，5-triazines which have been reported in the literature were insoluble and infusible It is interesting that these polymers can be formed into complexes with PdCl2 as de-termined by X-ray photoelectron spectroscopy (XPS)．The polymer complex (III) PdCl2，where (III) is poly[2-methyl-4，6-(1

4-phenylene)-1，3，5-triazine]，possesses catalytic activ-ity for hyarogenation．