The gas sensors have been made by mixture with Fe\-2O\-3? SnO\-2 and In\-2O\-3. The gas sensitivity of the mixture with various of oxides to C\-2H\-5OH? NH\-3? Ch\-3 COCH\-3? CH\-4 and petrol are measured. It is resulted that sensitivity of the mixture with varieties of oxides to CH\-3COCH\-3 is 3 times larger that pure oxide.