AMF(amplitude modulated frequency) is defined as currents in the frequency range 1 to 100Hz. The aim of this study was to determine the effects of blood flow and skin temperature according to different stimulating frequency($1{sim}30Hz,;30{sim}50Hz,;50{sim}100Hz$) of interferential currents. The results were as follow; 1. There were statistical significance on the blood flow with IFC 1, IFC 2, and IFC 3 group, and inter-groups(p<0.05). 2. There were statistical significance on the skin temperature with IFC 1 and IFC 3 group, and inter-groups(p<0.05). 3. IFC 1 was more statistical significance than IFC 3 group on blood flow(pP<0.05) 4. There was no statistical significance between IFC 1 and IFC 3 group on skin temperature(p>0.05).