尽管直接适用法制度已经在《中华人民共和国涉外民事关系法律适用法》当中得以确立,但中国直接适用法理论体系之构建仍有很大不足,进而影响其在司法实践中的正确适用。就存在的规范类型而言,作为实体强制规范在冲突法层面的投射,直接适用法不构成一类单独的强制规范,而表现为根据自身意图适用的公法性强制规范;就发生的冲突领域而言,区别于传统国际私法解决的私法冲突以及通过属地原则解决的公法冲突,直接适用法的出现导致跨国背景下的公私法冲突,需要将法院地的转介条款纳入到直接适用法制度当中加以妥善解决;就所属的选法方法而言,直接适用法不同于既往的双边选法方法,在方法论上构成真正意义上的单边方法。出于国家政策的相互尊重,有必要将直接适用法制度“双边化”,即通过此类规则在涉外私法案件中的普遍单边适用最终实现双边的选法结果。

Although the institution of rules of immediate application has been established in the Act of the PRC on Application of Law to Foreign-Related Civil Relations, the construction of theory system of rules of immediate application of China is not perfect enough, which in turn affects its correct application in judicial practice. As a reflection of substantive law at the level of conflict of laws, rules of immediate application cannot form a separate type of mandatory rules when it comes to its type, but are the mandatory rules of public law whose application are based on its nature and purpose. And it is different from the conflicts of private laws resolved by traditional private international law and conflict of public laws resolved by principle of territory when it comes to the area of conflict. Given that the appearance of rules of immediate application leads to conflicts of both private and public law among nations, it is necessary to embed referral clause of the forum into the system of rules of immediate application to properly resolve this problem. In addition, in terms of the selection of law, rules of immediate application adopts a meaningful form of single-side method instead of employing bilateral selection of law. Meanwhile, for mutual respect for national policies, it is essential to achieve the bilateralization of system of rules of immediate application. That is to say, the final implement of bilateral selection method is accomplished by universal unilateral application of such role in foreign-related private cases.