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I. Introduction In a world of ever-increasing transnational interaction, the importance of individual protection during the processes concurrently increases. Nationality is the principal link between individuals and states but also is the bridge connecting individuals with international law. It is just through the linkage of nationality can a person enjoy diplomatic protection by his parent state. But due to double nationality, there are lots of difficulties to effective diplomatic protection of individuals. The principle of effective nationality was formed through the judicial practice of international court of justice. What is the meaning of the principle of effective nationality? Is it a perfect theory in the face of diplomatic protection of dual national? In this article, the author will introduce the concept of this principle and give her opinions on it. II: The concept of principle of effective nationality Nationality of an individual is his quality of being a subject of a certain state. Nationality is of critical importance to individuals, especially with regard to individuals abroad or their property. Firstly, it is the main link between individual and a state. It is evidence that one can be protected by his parent state.Secondly, to some extent, individuals are not the subjects of international law, so they cannot directly enjoy the rights and undertake responsibilities coming from international law. It is through the medium of their nationality that individuals can normally enjoy benefits from international law. In principle, nationality as a term of local or municipal law is usually determined by the law of particular state. Each state has discretion of determining who is and who is not, to be considered its nationals. However, there is no generally binding rules concerning acquisition and loss of nationality, and as the laws of different states differ in many points relating to this matter, so it is beyond surprising that an individual may process more than one nationality as easily as none at all. But whether each granted nationality owned by these dual nationals has international effects is in doubt. In another word, the determination by each state of the grant of its own nationality is not necessarily to be accepted internationally without question. Especially, when a dual national seeks diplomatic protection in some third state, that state is not answerable to both of states of his nationality but only one of them. In this situation, the third state is entitled to judge which nationality should be recognized. As stated in Art1 of the Hague Convention of 1930 on certain questions relating to the conflict of nationality laws, while it is for each state to determine under its own law who are its nationals, such law must be recognized by other states only “in so far as it is consistent with international conventions, international custom, and the principle of law generally recognized with regard to nationality”. In the “Nottebohm” case, the International Court of Justice regard nationality as: ‘a legal bond having as its basis a social fact of attachment, a genuine connection of existence and sentiments, together with the existence of reciprocal rights and duties. It may be upon whom it is conferred, either directly by the law or as a result of an act of the authorities, is in fact more closely connected with the population of the state conferring nationality than with that of any other state’ That is wha