Reactive compatibilization is one of the main methods to improve compatibility by inducing a chemical reaction between two polymers during their blending, thus providing direct interaction between the polymers. In this way, the phase morphology of blends can be stabilized by preventing the coalescence of dispersed domains. The improved interfacial adhesion also results in better mechanical properties. MA is one of the most widely used reactive compatibilizers due to its good chemical reactivity, low toxicity, and low potential to polymerize itself under free radical grafting conditions. MA with a radical initiator, for the PLA/wheat starch blends, was reported to improve the interfacial adhesion between phases, and to produce higher tensile strength and elongation at break in 55/45 PLA/starch blends with 1% MA. Functionalized PLA with MA (PLA-g-MA) using DCP as an initiator by a grafting process, and applied PLA-g-MA to PLA/starch blends. All compatibilized PLA/ starch blends showed better interfacial adhesion, attributed to the chemical reaction between the hydroxyl groups and anhydride groups. The addition of 3 and 5 phr PLA-g- MA to the PLA/wheat straw composites resulted in significant improvements in tensile strength (20%) and flexural strength (14%) indicating improved interfacial adhesion between the fiber and PLA. In this study, we prepared PLLA/corn starch blends without and with one step reactive compatibilization process of MA in the presence of DCP radical initiator to improve PLLA properties. The effect of one-step reactive compatibilization on the physical and thermal properties on PLLA/starch blend was investigated, and feasibility of MA as a reactive compatibilizer in PLLA/starch blends was assessed. Keywords: PLA, Starch, Grafting, Property, Mechanical