Inst High Energy Phys, Div 1, Beijing 100039, Peoples R China
; Univ Sci & Technol China, Dept Modern Phys, Anhua 230026, Peoples R China
; CCAST World Lab, Beijing 100083, Peoples R China
Covariant helicity amplitude analysis for the process of J/psi --> gamma PP is discussed. Starting from the S-matrix elements of decay process, we deduce the formulae of helicity coupling amplitudes for two-body decay process. These formulae are used to analyze intermediate resonance states in the process of J/psi decay to gamma pi, gammaK (K) over bar, gamma eta eta' etc.