Nylon 11/graphene oxide(GO) nanocomposites were prepared by in-situ polymerization.Isothermal crystallization kinetics and melting behaviors of nylon 11 and its nanocomposites were investigated using differential scanning calorim-etry(DSC).The experimental results show that the Avrami equation can well describe the isothermal crystallization kinetics.The crystallization rate of pure nylon 11 was controlled by the crystals growth rate,whilst the crystallization rate of the nanocomposites was controlled by the crystals growth rate or the nucleation rate in the different range of crystallization temperature.In comparison with pure nylon 11,the nanocomposites display lower equilibrium melting temperature and surface folding energy.