Disclosed is a lyophilized liposome composition encapsulating a water-soluble drug and a preparation process thereof. The lyophilized liposome composition comprises a water-soluble drug, a phospholipid, a polyethylene glycol-derivatized phospholipid, cholesterol and a lyoprotectant, wherein the lyoprotectant comprises a saccharide and a cyclodextrin or cyclodextrin derivative. The encapsulation rate of the lyophilized liposome composition encapsulating the water-soluble drug is ≧90%.
