Abstract: A new assembling method was used in pure polycrystalline cubic boron nitride (PcBN) HPHT synthesis chamber. The cBN powder with particle size of 10 μm was used as the raw material. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to analyze the microstructure and the phase of the sintered body, and the compactness, the microhardness and the compressive strength were tested as well. Results show that pure PcBN with good properties could be obtained at a relatively lower sintering temperature by using this new assembly method. It is also found that the sample sintered at 7.5 GPa and 1 700 ℃ has the best microstructure density and that its hardness reached 3 992.7 Hv, which is higher than that of the traditional PcBN material. A large number of cBN-cBN particle bonds were formed in the sample, which effectively improves the comprehensive properties of the sintered body.