Multi-component white cast iron of 2%C-5%Cr-5%V-X%W_(eq) (X=2.5, 5.0, 7.5, 10.0, 12.5, 15.0, 17.5, 20.0) was casted and heat-treated to observe the morphology of carbide and matrix with the addition of different levels of W_(eq) (%W+2x%Mo). At W_(eq) ranged from 2.5 to 12.5, lamellar-type M₂C carbide was precipitated while plate-type M_2C carbide was observed in the specimen of W_(eq) above 12.5. More amounts of M₂C carbide were precipitated with more additions of W_(eq). The EDS results showed that Mo and W concentrations of plate-type M₂C carbide are higher than those of lamellar-type M₂C carbide. The matrix structures were composed of austenite and pearlite except for Heat 1 (W_(eq) = 2.5) where fully pearlitic structure was observed. At W_(eq) = 5.0, the amount of retained austenite in the matrix was highest which is amounting to 47.5% and decreased with the increase of W_(eq). Numerous tiny secondary carbides were precipitated in all the specimens homogenized at 950˚C for 3hr. However, M_6C carbide was not observed in as-cast and heat-treated condition. (Received February 24, 1998)