Contractual incidental obligation which developing from the principle of honest and credibility expands the contract obligation, pays more attention to the adjustment of the whole course of the contract relations, brings about really fair between the contract parties. So, it is accepted by many countries on theory and on justice. This thesis sums up the whole feature of incidental obligation from an overall angle and analyses the legal results integrally when breaching incidental obligation. In short, incidental obligation has different manifestations because of the difference of the deal circumstance and the contract nature, and becomes more and more complicated. How to affirm incidental obligation and how to dispose of the duty of breaching this obligation are all in arguments. So it is necessary to unify the theory about the obligation and make it statute. |