(1) When occurring a certain amount of clay slurry, it leads to the changes of moulding sand in properties.

(2) The rheological properties of modified clay slurry before and after the addition of accelerant, as well as consolidation mechanism of the slurry are discussed in this paper.

(3) In the paper, factors affecting blunging efficiency of clay slurry machine are analyzed.

(4) Slurry drilling method is widely employed in pile construction. Sediments at base and clay slurry along hole shaft cannot be avoided in construction procedure with this method.

(5) The formation of clay film may be considered in two main stages: mixing and coating, the bounds is whether the clay slurry occur.