The pile-drilling platform formed with the support of steel casing can adapt to complex engineering geologic conditions,reduce the use of large vessels and machinery,speed up the construction schedule and avoid the deformation of steel casing caused by concrete striking into it.By controlling the position and size of frothing orifice and adjusting the workability of the anchorage concrete,we can ensure that the steel casing get enough frothing height and thus form a rigid node of sufficient length between the steel casing and the bedrock to guarantee the stability of the single pile with steel casing during the flood period.