This study investigated the constitutive flow behavior and hot workability of in-situ 5wt% TiB2 reinforced 7050 Al alloy matrix composite by hot compression experiments.Based on the experimental results of flow curves,a constitutive model describing the relationship of the flow stress,true strain,strain rate and temperature is proposed.Substantially,it is found the constitutive equation of flow stress is dependent on the strain,strain rate and temperature.