The influence law of forming parameters on the spinning of Ti55531 titanium alloy cylinder was analyed.The results showed that using solid solution heat treatment system(880℃+insulation 30min/air cooling) Ti55531 titanium alloy can achieve better matching between the strength and plasticity.When the spinning temperature is 750 to 800℃,the metal fluidity is good,the apparent quality of spinning cylinder is good.And with the increase of spinning passes,spinning temperature can reduced appropriately,but the final spinning temperature is not lower than 650℃,spinning limit thinning rate achieves about 80%.The selecting of feed ratio is between 0.45 to 0.78 mm/r,the using of large feed ratio in the beginning pass can make the workpiece better fit the mould.The relative small feed ratio make the workpiece strip mould easily in the final pass,the pass thinning rate between 30% to 45% is more appropriate,which benefit spinning.