In this paper,the necessity of the uses of implied terms system of contract in domestic construction contract is pointed out,the main contents of the implied terms of contract about contractor s key obligations in construction contract are analyzed and studied.

While the A- merican law pays more attention to the factor of control and has developed the doctrines of"common control","distinct goodwill"and"material difference",the doctrine of implied consent in the English law implicates international exhaust.