A gas?solid separator which coupled a cyclone with a granular bed filter was put forward. It combined the mechanisms of the centrifugal separation and the filtration. The experiment was carried out under the conditions of both no-dust inlet and the fixed bed mode. The static pressure in the inlet annular space, the separation space and the dust hopper of the coupled equipment were measured. The experimental results showed that the distribution of the static pressure reflected the features of the flow field inside the equipment. Specifically, the tangential and axial distributions of static pressure assumed asymmetric profiles while they increased from the center towards the wall. A static pressure increasing region and a decreasing region in the separation space were observed, respectively. The influences of the negative pressure in the central area and the vortex on the static pressure were not clearly seen below H=6.41D. Moreover, it was also found that a low-velocity area appeared near the outer wall of the granular bed, which believed to be beneficial to the separation efficiency of the proposed separator. Based on the experimental data, a static pressure distribution model covering the physical parameters, the structural parameters and the operating parameters were given.