Polymeric nanoparticles of the diameter in the range of 1~1000nm hold great potential application in the field of biomedicine. There are some basic requirements for the application of polymer nanoparticles in biomedicine, such as narrow particle size distribution, high colloidal stability in aqueous dispersion, no pollution on nanoparticles surface and biocompatibility, but it is difficult to meet these requirements concurrently now. With the development of nanobiomedicine and bioengineering technology, the...