Influence of glutaraldehyde (GLA) vapor crosslink, solution crosslink and dextran dialdehydes solution crosslink on the mechanical properties of gelatin and gelatin/montmorillonite (MMT) nanocomposite was investigated. Fracture surfaces of the samples were observed by scanning electron microscopy (SEM). The results show that compared with solution crosslink, vapor crosslink could achieve higher crosslinking degree for gelatin material. GLA has higher crosslinking efficiency than dextran dialdehydes and mechanical properties of samples are better at same concentration via solution crosslink Gelatin/MMT nanocomposite could not be prepared via GLA solution crosslink It is needed much time for vapor crosslink to reach certain crosslinking degree owing to the barrier property of MMT sheets Intercalated with MMT could improve mechanical properties of gelatin material significantly. SEM shows the improvement of toughness at the same time.