According to applying conditions of low-strain detection technology,this paper proposes the problem of ignoring pile-top elevation,and lists its influences on construction quality,introduces its aftereffect and detecting results in practical engineering,and points out that low-train detection must be carried out on the basis of design elevation and be defined in the code.

The optimization design elevation in large earthwork can be determined by this method.

Some influential factors on the design elevation for leveling a site and its revising steps to calculate the earthwork have been introduced.

Unifies the Autocad graphics software carries on the computation to bridge in platform designed elevation,gai Liang transversal grade, the latitude versatility is good,easy to operate, the precision is high,can with the Autocad procedure very good union,achieves the enhancement working efficiency, quality this goal.