Janus particle is a kind of particle which has two parts with deferent property. The feature of this particle makes it use in construction of various structural materials. According to the preparation principles, the preparation methods including bulk phasebased asymmetry, asymmetry modification of surface and asymmetry blend, are reviewed. This classification makes the involved methods more specific and more comprehensive. The future requirements in preparation of functional materials and the preparation methods to meet these requirements are prospected.

Janus particles; preparation; selfassembly