Abstract: To solve the problems in dry cutting with traditional bond polycrystalline cubic boron nitride(PCBN),such as low heat resistance,non-stoichiometric ration TiN_0.3 is used to prepare new bonding system of PCBN.SEM,XRD and EDS are used to observe the polished surface and fracture of the samples,as well as the components and element distribution at the interface,thus analyzing bonding status of TiN_0.3 to CBN and TiN_0.3/AlN to CBN.Expansion coefficient and hardness are tested using DIL and FM equipment to discuss the difference between thermal expansion coefficients of TiN and CBN and the effect of this difference on the sintered body.Furthermore,AlN is introduced to reduce the effect of expansion coefficient.After coating Ti on CBN surface,TiN_0.3 and TiN_0.3/AlN are better bonded with CBN.The resultant at the interface of CBN to TiN_0.3 or TiN_0.3/AlN are analyzed,as well as its function in PCBN.