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The attitude of Special Tribunal for Lebanon to the issue of terrorism was introduced in its interlocutory decision on the applicable law. Author in this article is analysing its definition of distinct crime, its reasoning which was crucial to introduce such definition and its importance in relation to Lebanese law. The aim of this article is not only to identify the attitude of Special Tribunal for Lebanon but also to criticize distinct decision with intention to find, if STL argumentation is valid and sound, as this decision was highly criticised by a number of scholars. Last aim is to adopt an attitude toward to this decision in ways of its relation to international criminal law and international criminal judiciary on one hand and on the other hand its importance to proceedings at the Special Tribunal for Lebanon.