With the development of the technology of micromechanical processing, the Resistor Array becomes one of the most promising IR scene generators. In the Hardware-in-the-loop （HWIL） simulation system, it is usually used to test the real-time performance of IR camera, seeker and other IR detector systems. Resistor Array IR scene generator adopts resistors as their microemitters. When current passes each resistor, it is heated and produces IR radiation. By adjusting the current of each resistor, the temperature of the resistor can be controlled, and then the IR scene is generated. Radiation characteristics （including IR emissivity of dielectric film, effective blackbody temperature, temperature resolution） of suspend resistor the basic celI of Resistor Array dynamic IR scene generator are introduced.Our analysess how that the suspend resistor has the characteristics of low power dissipation and high effective blackbody temperature, which can meet the simulation requirement of MWIR and LWlR radiation in hardwarein -the -loop simulation system.