Abstract: The influence of four blended wall materials on spray-dried soybean oil microencapsulation was studied. Those four blended wall materials were composed by arabic gum (AG) , starch octenylsuccinate (OSA) , sodium carboxymethylcellulose (CMC) , carrageenin (CAR) , maltodextrin (MD) , soy protein isolate (SPI) . The performance of microencapsulation was characterized by microencapsulation efficiency, thermal stability, glass transition temperature (Tg) and surface morphology. All samples were broken down at 250℃, the microencapsulation efficiency of microencapsulation made by CAR-SPI-MD wall material was the highest which was 95. 10%, and its glass transition temperature (Tg) was 48. 9℃. The microencapsulation made by CMC-SPI-MD had the lowest microencapsulation efficiency and Tg, and both of the microencapsulation made by AG-MD and OSA-MD had moderate value. According to scanning electron microscope (SEM) , the particles were rounded, and most of them had no distinct fissures and holes, but there were some fissures and holes around the particle surface made by CAR-SPI-MD, so further studies were needed to improve it.