For the purpose of fabricating ferrite part with a complicated shape which has different orientation of the ferrite, joining of pre-formed green compacts was studied, and in particular the feasibility of combined sinter joining method was investigated. As the first step, two simple compacts of disk and ring shape have been individually produced under the non-magnetic field condition. The two compacts was assembled into a unit and then sintered at 1150°C and 1225°C. Effect of addition agent and sintering temperature on the joint strength of the the sintered compacts has been studied. The joint strength of the compacts sintered at 1225°C was about 2 times of that of the compacts sintered at 1150°C. The maximum joint strength was obtained when an inner disk with 0.75mass%CaO and an outer ring with 0.75mass%CuO was joined at sintering temperature of 1225°C.