The non-isothermal crystallization behavior of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blends under shear was investigated by in-situ polarized light optical microscopy (POM) and wide angle X-ray scattering (WAXS). Pulse shear for 5 seconds was applied to the melt during cooling. The effects of shear temperature and shear rate were systematically studied. It was found that the shear field could increase the nucleation density of stereocomplex crystal (SC), and accelerate the overall crystallization rate. The final crystallinity of SC increased to as high as similar to 45% with a shear rate of 178 s(-1) when the shear temperature was 150 degrees C. The onset crystallization temperature of alpha crystals increased by similar to 10 degrees C. The final content of alpha crystals reduced with the increase of SC content. Multiple factors influence the crystallization of SC and alpha crystals, including the shear rate, shear temperature and the nucleating/confinement effect of SC on alpha crystals. (C) 2015 Elsevier Ltd. All rights reserved.