A high voltage static electricity system is applied to microencapsuling proteins.The experiment of the drug microcapsule with bovine serum albumin (BSA) as drug and sodium alginate as carrier is carried out.The parameters in the experiment such as the ratio between core and carrier,the concentration of chitosan and the release of drug in microcapsule are studied in detail.Under the optimal conditions,the drug microcapsule is spherical and uniform with high encapsulation efficiency and drug loading.