The stem of a plant to research the styrene make monomer, the DIOCTYL PHTHALATE and Yellow-Oil-Soluble dyes make core, use the interfacial polymerization system to creates P.olystyrenes microcapsules. Change the speed of rotation and temperature to creates the different SIze particle of microcapsules, discuss microcapsules particle size and spread influence the core matter release effect. An result to show, change the speed of rotation have clear effect, fast speed have small particle and spread, slow speed is inverse. Particle sizes have striking effect with core matter release, bigger particle and shower release, smaller and faster.