New manufacturing processes, such as thermochemical and mechanochemical process, have been developed to obtain nanostructure W base composite powders using metal organic precursor as the starting materials. Nanostructure WC/Co and W/Cu powders which have homogeneous mixing state of component particles with 60㎚∼100㎚ particle size can be synthesized by the thermochemical and mechanochemical processing method. Nanostructure WC/Co powder has better sinterability than conventional submicron WC/Co powder. The combination of a thermochemical process and mechanical process is a useful method to obtain full density W-20 wt.%Cu composite alloy without addition of sintering activator by liquid phase sintering. The present study focuses on investigating the technical issues in manufacturing nanostructure W base composite powders by chemical processes.