A novel conjugated hyperbranched polymer containing bithiazole rings （PBTADB） was synthesized by polycondensation of 1,3,5-benzenetricarboxaldehyde and 2,2＇-diamino-4,4＇-bithiazole （DABT）. The structure of the hyperbranched polymer was confirmed by FT-IR and 1H-NMR. PBTADB dissolved in organic polar solvents such as DMSO and NMP. Bithiazole tings were introduced to provide bidentate N-donor sites for binding metal ions. The metal complexes were prepared by chelation of the polymer with Co2＋ and Sm3＋. The magnetic behavior of coolcdination compounds was measured as a function of magnetic field strength （0-4.8 ×106 A/m） at 5 K and as a fimetion of temperature （5-300 K） at magnetic field strength of 2.4×106 A/re. The magnetic hysteresis loops of PBTADB-Sm3＋ and PBTADB-Co2＋ showed the typical ＇S＇ shape at 5 K with the Curie-Weiss temperature To = 96 K and 41 K respectively. The results show that they exhibit properties of soft ferromagnetic materials.
