System of Court to assess amount of damages in civil procedure was set up in 2002. The system needs court to take all circumstances into consideration and assess damage by its own impression, when the party can't or is hard to prove the amount thought having proved the damages. This regulation doesn't simply acknowledge judicial practice, proclaim precedents in writing, and inherit the legislations of German, Austria, and Japan. It focus on the characteristic of damages matters and alleviates the party's burden of proof based on the protection of procedure interests and the balance of substantial law and procedural law. Furthermore, it grants courts the discretion of evaluation of law and determination of fact. Accordingly, courts may assess the damage without the limitation of substantial law and can alleviate the level of proof. To carry through the intention of the amendment, we should extendedly apply the system to complete and total claims, and better to apply the system in the matter of assessment of other obligations, fiction of fact brought form the violation of burden to address evidence, and the ascertainment of stature of territory and property by analogy. Though the discretion to assess damages is restricted to the principle of disposition and adversary, the courts may not investigate the proof requested by parties or investigate by a frugal and way if necessary. Furthermore, the court can assess damages by its own impression. Nevertheless, to protect the procedural right of parties and prevent surprising judgment, the court should disclosure its opinion above and discuss in fact and law with parties. Therefore, the parties could obtain the opportunities to add, diminish, and supplement claims.