The perturbative theory: A physical observable p could be written as the perturbative form =En P(AR)+r1a.p+1 (μ)+x2aP+2(k)+. Q s Di yts Reliable High precision a。<1 High-order prediction; Introducing renormalization scheme/scale regularization, renormalization, /scale -setting =QCDa(M2)=01181±00011 ame import Q(GeVT Up to infinite order, there is no scheme-and scale- dependence, i.e., any choice of scheme/scale should result in the same prediction. Standard Renormalization group invariance(RGI)The perturbative theory: A physical observable  could be written as the perturbative form Up to infinite order, there is no scheme- and scale￾dependence, i.e., any choice of scheme/scale should result in the same prediction. “Standard Renormalization group invariance (RGI)” High-order prediction; Introducing renormalization scheme/scale regularization、renormalization、scale-setting same importance 𝛼𝑠 < 1 Reliable High precision