Worm powder extrusion molding(PEM) technology of hardmetal powder using novel binder system has been probed into. A newly developed binder system comprises a major fraction of low molecular weight components(LMWC) and a minor fraction of polymer.The binder was fabricated by heating melting method combined with solvent solving. The feedstock was mixed as a thick slurry at room temperature and was rapidly homogenised by stirring at a adequate shear force. The microstructure of the moulded specimes was observed by scanning electronics microscopy(SEM). The binder was debinded step by step. At the first stage of debinding, the LMWC were removed, and the interconnected capillaries were formed in the moluded green bodies. At the second stage of debinding, the remaining high molecular weight components were completely removed out. The second stage debinding heating rate can be faster than the first stage. The thermal debinding mechanism was studied by thermogravimetry (TG) and differential thermogravimetry(DTG). This research shows that the thermal debinding rate is controlled by three dimensional diffusion mechanism. The PEM hardmetal products with good properties and diameters of up to 20mm have been manufactured.