Discrete nano-aggregates of a poly(ethylene oxide)-b-polybutadiene diblock copolymer(PEO-b-PB)were obtmned by self-assembling of the copolymer in a selective solvent of PB followed by the shell cross-linking．The average behaviors of the PEO crystallization and melting confined within the nano-structured aggregates were studied by differential scanning calorimetry experiments The experiments demonstrated that the confinement effect arisen from the shells could be tuned by adjusting the degree of PB cross-linking．For the deeply cross-linked sample

the individual paaicles only crystallized at very low crystallization temperature(Tc)

wherein the homogenous primary nucleation determined the crystallization rate．For the lightly cross-linked sample

the confinement effect is Tc dependent．When Tc exceeded 42℃

the lighfly cross-linked sample possessed a higher melting temperature and a lower crystallinity compared with the pure PEO-b-PB.