In order to tackle the problems of fast wear and short life of impregnated diamond bit in abrasive formation, the WC was added to iron base prealloyed powders as matrix metal owing to the characteristics of high hardness, high wettability and good abrasion resistance of WC. The hardness, impact toughness and bending strength of the matrix sample with different WC contents were tested to find the influence law of the support metal WC on the matrix performance. The results show that with the gradual increase of WC contents, the hardness, the impact toughness and the bending strength of the matrix sample exhibit the same trend: increase first and then decrease. From the perspective of micro-structure and energy, the reason of this rule is analyzed. Finally，it is concluded that the matrix achieves the optimal performance when the sintering temperature is 830℃ and the WC content is 5%. In this case, the strength and abrasiveness of the matrix sample are the maximum.