Semi-solid rheological slurry of ZCuSn10 copper alloy was prepared by strain induced melt activation（SIMA）based on cold rolling and remelting method.The influence of the forming specific pressure and extrusion rate on the microstructure of semi-solid ZCuSn10 copper alloy slurry prepared was investigated to understand the evolution law of solid and liquid phases during the forming process.The results indicate that the microstructure of the extrusion parts becomes uniform with the acceptble solid-liquid synergy liquidity with the forming specific pressure of 150 MPa and extrusion rate of 14mm/s.The microstructure of the semi-solid extrusion parts at different position is different at the same extrusion conditions.The microstructure of near punch position keeps the initial semi-solid microstructure.The microstructure of the sample at middle position belongs to semi-solid microstructure with solid-liquid two-phase and high roundness solid particles.The microstructure of sample at the front end is liquid phase with low distribution uniformity of the solid-liquid two phase.