Abstract: The effect of blending various coals on the properties of coal water slurry (CWS) was studied. Three Chinese coals with lower slurryability and static stability or poor rheological behaviour and two others with good properties of CWS as well as a lignite with better rheological behaviour but poor slurryability were selected in this study. The results showed that the addition of coals with higher slurryability and static stability to those with poor quality of CWS can improve the slurryability, stability and rheological behaviours, and forthemore, the viscosity of CWS decreases markedly. For the different blending propations, the coal content in the slurry can be increased by 2%～3% and the static stability enhances from 1 d to 10 d for the formation of soft sediment. The addition of lignite with poor slurryability can also remarkably improve the stability and rheological behaviour of CWS. It seems to be that blending the coal with greater difference in the surface properties including pore structure, contact angle and MHC can improve the properties of CWS.