High selective proteasome inhibitor antitumor drug bortezomib is synthesized in four steps.The synthetic route is as follows: firstly, compound (4) is obtained through condensation reaction between (1aR,3aS,4S,6S,7aR)-hexahydro-3a,8,8-trimethyl-alpha-(2-methylpropyl)-4,6-methano-1,3,2-benzodioxaborole-2-methanamine-2,2,2-trifluoroacetate (2) and 2(S)-N-BOC-amino-3-phenylpropionic acid (3), Compound (4) was removed BOC group under acid condition to obtain deprotection compound (5 ).Secondly, compound (7) is synthesized through condensation reaction between compound (5) and pyrazine-2-carboxylic acid (6).Finally, compound (7) was removed pinane group by isobutaneboronic acid to give bortezomib (1).The structure of bortezomib was confirmed by 1HNMR, 13CNMR, MS and IR.The synthetic method has the advantages of cheap raw materials, few reaction steps, mild reaction conditions and higher product purity, which is favorable for industrial application.