The interfacial bond strengh and microstructural analysis of pre-heat treated porcelain-fusedmetal(PFM) were investigated using a mechanical three-point bending tester and scanning electron microscope(SEM). Four kinds of heat treated samples were prepared as follows ; A: Heating $1200^{circ}F{ o}1600^{circ}F$, holding 1min, reheating ${ o}1850^{circ}F$, hold 3min under vacuum, B: heating $1200^{circ}F{ o}1600^{circ}F$, holding 1min, reheating${ o}1850^{circ}F$ under vacuum conditon, C: heating $1200^{circ}F{ o}1600^{circ}F$, holding 1min, reheating${ o}1850^{circ}F$, holding 3min in the air, repeat same heat treatment process under vacuum condition, D: heating $1200^{circ}F{ o}1600^{circ}F$, holding 1min, reheating${ o}1850^{circ}F$, holding 1min in the air. The three-point bening test result shows that the interfacial bond strength of specimen B and C were higher than that of A and D. The SEM study indicate that Specimen C shows the highest surface density.