Matrix wear resistance (matrix hardness) is an important technical specification of diamond bit, which has direct influence on choice of bit to be used and drilling practice parameters and the improvement of technical and economical indexes of drilling. At present, real matrix hardness of bits applied in drilling engineering is lower than the nominal hardness of the factory bits that has misleading and negative influence on drilling efficiency and bit footage. In order to improve matrix wear resistance, researches were carried out on the improvement of hot pressing sintering technology, increasing the proportion of tungsten carbide in matrix materials and the mixing time of matrix materials. It is suggested that for the improvement of hot pressing sintering technology, Russian cold pressing sintering technology, with sintering pressure of 70～100MPa, should be discussed, which is much higher than the pressure of hot pressing sintering in China.