Trehalose,sucrose,maltose,lactose and glucose were used as protectants for platelet freeze-drying,the effects of various kinds of saccharides and their concentrations on the viability of freeze-dried platelets were investigated.Raising the concentration of trehalose to 20%,the recovery rate of nonactived platelets can reach to 85.7%.For various kinds of saccharides with the same concentration of 20%,the recovery rate of nonactived platelets is above 70%,trehalose is slightly higher than others,however there is no statistically significant difference among them.