Abstract: The loss, initial permeability, maximum flux density, Curie temperature, resistivity, volatilization of Zn and microstructure of low loss Mn-Zn ferrite at the different sintering temperature were investigated. The results showed that loss droped before rising,sintering density and permeability went up,volatilization of Zn was serious,and maximum flux density and Curie temperature were negligibly changed with the rising of sintering temperature.Microstructure of the samples was directly affected by sintering temperature.It was suggested that the sintering temperature is one of key factors which decide the electromagnetic characteristic of Mn-Zn ferrite.