Cloud explosion is the main characteristic of fuel-air explosive(FAE). The blast temperature parameters of two FAE testing bombs with liquid fuel and one with solid FAE were measured by infrared thermo-imaging technology. The temperature distribution of blast fireball at different times was obtained and the fuel casting phenomena were analyzed. Experimental results show that the surface temperature of blast fireball of FAE with liquid or solid fuel are 22.3% or 6.2% higher than that of TNT respectively when their charge quantities are the same. The high temperature durations of two FAE bombs are 1.95 and 1.23 times large than that of TNT, respectively. The fireball overcast area of liquid fuel is bigger than that of solid one. The thin shell treated with charactering grooves is beneficial to the fuel casting and dispersal.