In the study, the effects of annealing condition and 1~10 wt% isopropylphenyl diphenyl phosphate (IPPP) on crystallization behavior and flame retardancy of a full name (PLA) film were determined. The crystallization kinetics of PLA films with adding 1, 5, and 10 wt% IPPP at were higher than those at 130 and . The average crystallinity and crystallite size of PLA film with 1 wt% IPPP were 21.3% and 24.8 nm, respectively. With an increasing IPPP content, the crystallinity of PLA film increased and the crystallite size decreased. The burning rate lowered with an increasing IPPP content as well.