NOVELTY - Preparation of doped strontium titanate involves: preparing titanium source solution by adding dropwise titanium salt and organic matter into buffering solution to obtain titania white colloid; adding nitric acid to titania colloid completely dissolve to obtain titanium source solution A; mixing strontium salt and doping element to obtain mixed solution B; colloid preparation by slowly adding solution A dropwise to the solution B, with volume ratio of 1:0.8-1:1.2, adjusted to pH neutral, to obtain wet gel, drying the wet gel to obtain a dry gel; preparing powder and incubating.    USE - For preparing doped strontium titanate (claimed) for used for gas sensitive sensor, fuel cell electrode and catalyst.    ADVANTAGE - The method is carried out in low temperature, low energy Consumption. The method is simple, is suitable for laboratory and industrial production. The method obtained titanate with high purity, fine grain size.    DETAILED DESCRIPTION - Preparation of doped strontium titanate involves: preparing titanium source solution by adding dropwise titanium salt and organic matter into buffering solution with titanium salt and organic buffering solution ratio of 2:1-1:2, adding alkali solution to adjust pH value to more than 7 to obtain TiO2 white colloid in ratio of 1:6-1:4; adding nitric acid to TiO2 colloid completely dissolve to obtain TiO(NO3)2 solution, that is, titanium source solution A; mixing the strontium salt and the doping element to the doping amount of the desired salt, where the EDTA and NH4NO3 molar ratio is 1:23.15-2:8.05 mixed, and finally mixing the two solutions at a volume ratio than 1:0.8-1:1.2 and mixed to obtain solution B; colloid preparation by slowly adding solution A dropwise to the solution B, with volume ratio of 1:0.8-1:1.2, adjusted to pH neutral, to obtain wet gel, drying the wet gel to obtain a dry gel; preparing powder by taking the dry gel at temperature of 1-3 degrees C/minutes and raised to temperature of 700-900 degrees C, and incubating for 1-5 hours to obtain doped strontium titanate powder.