Abstract: A kind of synthesized resistor is proposed to emulate thermal resistors in an interface simulator.Several key problems of synthesis are discussed in detail,such as the precision improvement of synthesized resister,the voltage scope expansion of resistor's application circuits,the synthesis circuits adaptation for positive or negative voltage,the multi-channel synthesis circuits development on one board,and the nonlinear characteristic curve fitting.The calibration experiments show that,the steady state accuracy of this synthesized resistor is better than 0.02 Ω,and under the control of programming,it has good dynamic resistance simulation capability,therefore,it is very suitable for matter-in-loop simulation experimentation of aero-engine control system.