Abstract: Experiments were carried out to study the molding mechanics and optimal conditions of the forming of chitosan fiber. And it was found out that the sound contents of chitosan, acetic acid and carbamide in the chitosan spinning dope should be 3 5 wt%,2 wt% and 1 wt%,respectively, and the glycerine 0 5 times of chitosan. Compound coagulating bath of bicomponent or tricomponent were found having better molding effect. The suitable spinning conditions were obtained:spinneret draft factor -68%, plasticization drawing factor 22%,water bath drawing 9%,these drawing baths' temperatures were respectively 60 ℃ and 80 ℃,fiber was washed in the water of 55 ℃.