Abstract: In order to improve the slurry stability of the coal water slurry, based on the micro porosity and crack theory of the coal particle, a high pressure water jet type preparation technique of coal water slurry was provided.The water jet type prepared technique of the coal water slurry would have the following advantages:①Mo re different coal suitable for the preparation of the coal water slurry;②Well controlled average particle size of coal in coal water slurry;③Less dispersant applied to the slurry preparation and no stabilizer was applied;④A good stability of the coal water slurry;⑤In comparison with the traditional coal water slurry, the coal water slurry wi th same type coal and same density would have a low viscosity.With the same type coal and same viscosity, a coal water slurry with a higher density could be prepared; ⑥A matched relationship between the coal type and the additive improved;⑦In comparison with the traditional preparation technique of the coal water slurry, the water jet type preparation technique of the coal water slurry with energy saving of 20%;⑧ItOs suitable for long time storage and long distance transportation.The storage exp eriment and the combustion showed that the water jet type coal water slurry prepared with the coal water slurry refining device and the completed set equipment would have no consolidated settlement after two year storage and the combustion was stable.The combustion ash was grey and no slagging phenomenon occurred.The applic ation effect was excellent.