Abstract: Nanocolorants were prepared by miniemulsion polymerization with sodium α-olefin sulfonate (AOS) as polymerizable emulsifier, styrene (St) as monomer, methyl methacrylate (MMA) as polar mono mer, divinylbenzene (DVB) as crosslinking agent, hexadecane (HD) as co stabilizer. Transmission Electron Microscopy (TEM) and Dynamic Laser Light Scattering (DLS) were used to study the effects of the amount of AOS, polar monomer and crosslinker on the morphology of nanocolorants. Results showed that the average particle size of nanocolorants decreased with the increasing of the amount of AOS. Appropriate amount of polar monomer was helpful to produce the core shell particles with narrow particle size distri bution. The difference of polarity between monomer and crosslinker led to the rough surface of nanocolo rants. When St was used as monomer, the nanocolorants appeared crumpled surface as the mass of DVB relative to St was higher than 30%. However, for MMA, the nanocolorants appeared serious crumpled surface when the mass of DVB relative to MMA was in the range of 8%—30%.