Univ Sci & Technol China, Dept Modern Phys, Anhua 230026, Peoples R China
; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
; CCAST, World Lab, Beijing 100080, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The deviations of R-c, R-b from the standard model are discussed within our theory, the chiral extension of standard model and its supersymmetrization. Combining R-c, R-b with the coupling constants g(v), g(A) of Z(0) decay, Gamma(W+ --> e(+)nu(e)) of W+ and the Michel parameters rho(tau) of tau decay, the mixing angles between hadronic and leptonic quarks and the form factors of the leptonic axial currents are determined within experimental errors, from which it is found that the mass of down leptonic quark of the third generation is about twice the mass of top quark.