Abstract: Analytical study has been made by selecting large type cemented carbide anvils and dieswhich have been used in imported production line. Experiments showed that BOART andPLANSEE anvils and dies are made of WC-Co system alloy. The Co comtent in the anvils is 5%and that in dies is 9.5%. The anvils is of layer structure with obvious different structures between various layer,but their common features are low porosity,Less defects,no impurities and ofheterogenerous structure. The top core of anvil has η phase,while dies do not show layer structureand have no η phase.