Abstract: Based on the four dynamic threshold voltage NMOS transistor and two active resisitor,a novel 1.2V low power analog multiplier is prensnted in CSMC 0.6μm DPDM CMOS process.The number of input transistor has been decreased and the biased transistor and circuits have been saved.When the 5MHz input signal V_inA with 1.0V peak-to-peak amplitude and the 100MHz input signal V_inB with 0.5V peak-to-peak amplitude,the peak-to-peak amplitude of output signal V_out is about 350mV.The margin between the first order harmonious wave and the third order harmonious wave of the output wave is about 40dB.The frequency bandwidth of the 1.2V CMOS analog multiplier is 375MHz,and the average power supply current is 30μA.It is fit for portable electronic product and below 400MHz bandwidth field.