  In the light of SU(3) flavor symmetry, the effective interaction Hamiltonian
in tensor form is obtained by virtue of group representation theory. The strong
and electromagnetic breaking effects are treated as a spurion octet so that the
flavor singlet principle can be utilized as the criterion to determine the form
of effective Hamiltonian. Two body decays of both baryonic and mesonic final
states are parameterized in the uniform scheme, based on which the relative
phase between the strong and electromagnetic amplitudes is studied for various
charmonium decay modes, including psi' and/or J/jpsi decay to octet baryon
pair, decuplet baryon pair, decuplet-octet baryon final state, and
pseudoscalar-pseudoscalar meson final state. In data analysis of samples taken
in $e^+e^-$ collider, the details of experimental effects, such as energy
spread and initial state radiative correction are taken into consideration in
order to make full use of experimental information and acquire the accurate and
delicate results.
