The catalytic air oxidation of geranioi was carried out in packed-fluidized beds. Copper gauze of various structures were packed as catalysts and glass beads or quartz sand were fluidized through the voidage of packed catalyst to make the reaction isothermal. It was found that a larger value of (u_f - u_mf)/u_mf, smaller diameter of unit packed space and considerably larger fluidized particles tend to improve the reactor efficiency. A two-phase model was applied to interpret the experimental results.