The effects of friction stir processing on the structures and performances of Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy were investigated. The results show that the microstructure of the stir zone exhibits amorphous state after friction stir processing. The strength of base metal, heat affecting zone (HAZ) and stir zone are almost similar under room temperature quasi static state compressing. However, the elastic modulus of the stir zone and the HAZ is increased markedly and the serration flow phenomena are found in the compressing curve of HAZ and stir zone before fracture. The fracture surface of stir zone and HAZ exhibit obvious multiple shear characters. It is considered that friction stir processing changes the concentration and distribution of freedom volume in stir zone and HAZ