The fundamental paradigm of anti-unfair competition law concerns the philosophies, values, patterns and criteria of defining what constitutes anti-unfair competition, which can be summarized as so-called“three perspectives”, including competition perspective, impairment perspective, and right perspective. It can also be achieved by further weighing the interests concerning competitive behaviors. This“3+1”judgement pattern, namely“three perspectives”plus benefits measurement assessing the rationality of competitive behaviors, constitutes fundamental dimension of anti-competition law. Among“3+1”judgement pattern, “three perspectives”are philosophical footholds, and benefits measurement is the path to fulfillment, so“3+1”pattern constitutes the unique paradigm of assessing the rationality of competitive behaviors. The assessment of anti-unfair competition should adhere to dynamic competition perspective, neutrality of impairment and neutrality of rights. Further, the assessment also needs to concentrate on the rationality of behaviors rather than the protection of rights, and meanwhile, to do interests measurement by referring multi-factors to decide the rationality of competitive behaviors.