Discussion on issues of engineering alteration and construction claim

In the civil and hydroelectric engineering management, engineering variations are always solved by the way of construction claim compensation, which no doubt increases the difficulty of the claim. In this paper, through definition of engineering changes and construction claims, and discriminating analysis of their processing program and mode of payment, it is presented that contractor should use the clause of engineering alteration rationally. Defects of drawing and technical specification, changes of owner´s require and strict inspection and inappropriate refuse of engineers should be listed in engineering alteration, try to make it legalization. In the end, an example is taken to illustrate the effect, which makes the contractor gain more benefit and decrease less loss.