With the development of system on chip (SOC),the precision and power consumption requirements of bandgap reference are becoming more stringent.Until now,high order temperature compensations still have some restrictions in the process compatibility,design complexity and power consumption.In this paper,the temperature characteristic of a new current mode bandgap reference operating in saturated region is derived,and effective curvature compensation is implemented by current ratio subtraction in the output branch circuits with double bandgap structures.Thus,a new CMOS bandgap reference of double bandgap structures is implemented.Layout area of the bandgap reference is 0.066 mm2 in GSMC 0.18 μm process.The results of Monte Carlo post-simulations show that the average temperature coefficient is 14.27 ppm/℃ in the temperature range from -40～125 ℃,and the average reference voltage is 1.201 V at 27 ℃.The average static current is 9.865 μA and the power supply rejection is -37.21 dB at 3.3 V operating voltage.The bandgap reference designed in this paper has the characteristics of high precision,low power consumption and simple structure,which indicates that it is a better choice for SOC.