The key points of this chapter are (1) the concept, type and characteristics of the construction contract of the construction project (2) the conditions for the effectiveness of the contract, and the specific conditions of the contract with undetermined validity, invalid contract, changeable or revocable contract. (2) The general rules of contract performance, and the concepts of defense right, subrogation right and cancellation right in contract performance. (3) Conditions for termination and dissolution of the contract. (4)