Degradation in vitro of cs rod was studied . results of weight loss and molecular weight change of cs rod degrading in phosphate buffered solution for 16w indicated that cs degraded very slowly 对壳聚糖棒材体外降解进行了初步的研究,发现棒材在磷酸盐降解液中16w后失重率和分子量降低不明显,表明壳聚糖降解非常缓慢。