The IR-CRT scene simulator is the nuclear device of IR imaging guided simulation system. It bases on cathodoluminescent that using IR-CRT to convert video signals to IR images. The development of IR phosphors and the structure design of IR-CRT which screen be refrigerated to 77 K are explained in this paper. The research result of 3 approximately 5 um IR-CRT simulator is presented. This device can generate dynamic IR images clearly and steadily. The technical index is given as follows: space resolution is 120 L/in; the Tmax simulated is 97 degree(s)C, the (Delta) Tmax is 86 degree(s)C; dynamic range is 103.