A unified mechanism is proposed to explain the radiative decays and G-parity-conserving decays of the J particle into ordinary particles: According to this mechanism the J particle first decays into the intermediate state φn = αφ1+ βφ8, and then φn decays into ordinary particles. The following results are obtained:1. The predictions are in best agreement Math the experiment if φn≈ω, with the exception that the predicted ratio Γ(J →ω→ ηγ)/Γ(J →ω→πγ) is too small. 2. In order to fit both radiative decays and decays into two hadrons, the form factors for these two types of processes must differ by a factor 103. Using the straton model a method for calculating these form factors is given which explains the above difference quite well.3. Another possible mechanism of radiative decays of the J particle is also discussed, and some difficulties are pointed out.