| To discuss the problem of the contract validity period since Rome began, which has lasted for thousands of years has been debated, but in theory the core point of this debate has become one of the most complex of civil law system, one of the most difficult problems. The reason of different countries in different periods is the theory of how to form and how to apply? The doctrine of every cause must be interpreted in the application can be tested properly or not, since the millennium, the reason theory experienced the legitimacy of the contract validity from the Rome law mainly depends on the strict form, by Aristotle and Aquinas to the medieval jurists philosophical interpretation of the law of Rome, with generous exchange and moral meaning of justice the reason to explain the legitimacy of the validity of the contract, To modern times, with the promise and the acceptability of the model contract, taking the essence of ethical content contract theory ultimately weaken its applied value. In short, the cause theory from germination to the whole process of strong final decline, that is the change process of theoretical basis of validity of the contract, the contract although the reasons varied, as the city of the first king of the flag as a constantly changing but that effect, the contract must have reason always rock solid, recently in the process of the integration of European private law claim abandoned the cause theory in the contract law is more and more high, the application of the contract law but not necessarily be able to copy the voice in our country, mainly lies in the present stage our country law system is not perfect, the lack of the general obligation law on the part of all the contact is not complete, so the cause theory in contract law are still applicable to in particular, on the basis of the origin and evolution of the theory of cause, can be better for the contract law of our country to solve the difficult problems of theory. |
