A water-phase composition for producing microparticles is used to solve the problem of excessive surface tension of conventional water-phase fluids that leads to poor formation of spheres in oil-phase fluids used together with the water-phase fluids. The water-phase composition for producing microparticles includes a water-phase fluid, an amphiphilic polymer stabilizing agent, a water-phase surfactant, and an organic solvent.一種用以製造微粒之水相組合物，係用以解決習用水相流體的表面張力過大，使與其搭配使用之油相流體成球性不佳之問題，其包含：一水相流體、一雙性高分子穩定劑、一水相界面活性劑及一有機溶劑。
