YFeO~3 gas-sensing materials were prepared by sol-gel method. The preparation conditions, phase constituents, conductance and gas sensing properties were investigated. The results shows that pure phase YFeO~3 can be obtained when calcining for two hours at 800℃ with the ratio of substance Fe^3^+ to Y^3^+(nFe^3^+:nY^3^+ being 1:1. The YFeO~3 thus obtained is a p-type semiconductor. The temperature of conductance sudden change for the element made of powder with 2 h preheating gel calcined at 800℃ for 3 h is only 400℃ , with good sensitivity and selectivity to C~2H~5OH. This material is possible to be developed into a new type of ethanol-sensing sensor.

Key words: SOL-GEL PROCESS, PEROVSKITE TYPE STRUCTURE, GAS SENSITIVITY MATERIAL, DOUBLE OXIDE, IRON OXIDE, YTTRIUM OXIDE, ETHANOL, SENSORS