In order to obtain the relaxation time of the resistor array infrared decoy transformation, and to settle an idea for improving transformation speed of patterns through testing and analyzing the temperature variety characteristics of different resistors, a conclusion is as follows: Among familiar resistors, metalfilm resistor has the shortest relaxation time in increasing and decreasing temperature which is approximately 30 s. Two kinds of constantan resistance wire's relaxation time are longer than Metal film resistor's, the time of increasing temperature extends about 22.4%, and the time of decreasing temperature extends about 43.9%, the relaxation time of increasing and decreasing temperature of glazed wire wound resistor and Ceramic wire wound resistor are relative longer, which more than 100 s.One resistor has about the same relaxation time under different voltages. The relaxation time of cooling is longer than that of temperature rise to the same resistor. To shorten the relaxation time of temperature variety and improve patterns' transformation speed, the resistor and the dielectric material must have small mass and heat capacity.