Chain extended Poly (L-lactide acide) (PLLA) was prepared via reactive melt mixing. To investigate the effect of the chain extender content on non-isothermal crystallization kinetics, different crystallization rates of 2.5, 5, 7.5 and 10 ° C/min from the melt and different amount of an epoxied chain extender were used. The relative crystallinity and Avrami equations were used to study the kinetics of crystallization. Due to structural restriction on PLLA at high cooling rate (7.5 and 10 ° / min), the crystallization process for pure PLLA and PLLA with 0.25wt. % Joncryl did not occur, and the samples were completely amorphous. A higher crystallization temperature was indicated for the PLLA with 1wt. % Joncryl sample, which showed a faster crystallization kinetics. Using the 0.25 wt. % of Joncryl in chain extension reaction resulted in lower crystallization temperature due to the presence of branched chains. Results of Avrami n and k values showed that PLLA with 1wt. % Joncryl had higher crystallinity whereas this value for the PLLA with 0.25wt. % Joncryl was lowest among the other samples.