According to the experiment of aligned porous gelatin scaffold by unidirectional freeze-drying method . The result of gelatin scaffold have diameter is 3.25 cm , average thickness is 1.1625 cm , the mass of scaffold is 2.1994 g and the density of gelatin is 1.037 cm^(-3) ,can calculate to % porosity is 87.0163 % . The porosity of gelatin scaffold have low porosity < 95% , it shows the porosity from this result lower than normal porosity of the research ( X.Wu and other) . Because of the gelatin scaffold have hardly crosslinking agent , so the amount of crosslinking agent hardly has any effect on the porosity of the gelatin scaffolds.