The longitudinal and radial solid concentration distribution of petroleum coke water slurry(PCWS) was obtained by using cryosectioning method to evaluate the stability of PCWS. The solid concetration distribution shows that, the PCWS has obvious stratification along the longitudinal direction, and the closer to the bottom, the solid concentration is higher. For the same type of PCWS, the stability of the solid-liquid two phase suspension is better when its apparent viscosity is higher. After placed still fo...