Abstract: Alkaline fuel cells (AFCs) have been widely investigated since the 1960s ^[1]. The alkaline fuel cell systems attract more and more attention of researchers because of their high power efficiency, distinct advantages under the conditions of low temperature and alkaline environment as well as the low cost^[2,3]. As the most important part in alkaline fuel cell, the anion exchange membrane has been studied widely^[4]. In this study a novel cross-linked polyphosphazene polymer containing crown ether functional groups was prepared. The polydi(benzo-15-crown-5)phosphazene-hexanediol (PDB155P-HA) polymer was synthesized by the nucleophilic substitution between 4-methylol-benzo-15-crown-5 and polydichlorophosphazene, and then the polydi(benzo-15-crown-5)phosphazene was crosslinked with 1,6-hexanediol. The polydi(benzo-15-crown-5)phosphazene-hexanediolhydroxide (PDB155P-HAH) membrane was synthesized by an anion exchange of PDB155P-HA with NaOH.  The chemical structures of the membrane was examined by Fourier Transform Infrared Spectroscopy (FTIR), Nuclear magnetic resonance spectroscopy (¹H-NMR), and Thermogravimetric analysis (TGA). Test results showed that the membranes had a good thermostability. The fuel cell performance was measured by the ion conductivity, ion exchange capacity (IEC), water uptake (WU), and swelling ratio (SR). The ion conductivity was as high as 74.8 mS cm^-1 at 90℃. The membrane was stable with a smaller decrease in conductivity after being treated by 4 molL^-1 NaOH at 60℃ for 240 h or 2 molL^-1 NaOH at 30℃ for 1000 h, which indicated that the membrane had an excellent stability under alkaline condition.