In asymmetric poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends, the pre-existing stereo complex crystals can impose confinement effects on homocrystallization of uncomplexed PLLA among them., However, confinement effects are very weak in the blend films because of relatively large PLLA domains distributed in the skeleton of stereo-complex crystals. As a comparison, in the electrospun blend fibers, fine distribution of uncomplexed PLLA results in strong confinement effects. This is manifested by the significant decrease in the crystallization temperature and melting point. Even so, confinement effects have little influence on the crystal form, and PLLA alpha-crystals prevail in the electrospun blend fibers after melt crystallization. Finally, confinement effects in the electrospun blend fibers depend on annealing teriveratures and almost disappear when the samples are annealed above the melting point of stereocomplex crystals.