The biosignal delivery law includes incidence,reflection and refraction which are three main characteristics and embodiers of the Interference Law.Relative to biology,the biosignal delivery Law reflects the relationship of reason,phenomenon and essence between life inheritance and environment factors.Incidence,reflection and refraction supplement each other and meanwhile effect and restrict each other.There is ambivalent triangle relationship in the three aspects.The biosignal delivery Law takes on characteristics of relativity,repetition and space-time expression.The refractive index,which contains the full matter of incidence and reflect,is the essence of biology and exhibits as biology heritability.Any interaction still has a third or more results besides the two sides,of which not any contradictory relation of any subject makes an exception.