"The preparation of Barium Strontium Titanate (Ba0.7Sr0.3TiO3) prepared by sol-gel combustion method were studied. Citric acid, urea and glycine were used as the fuel to reduce the calcination temperature. The molar ratio of sol powder: fuel was 1:1. All of the samples were calcined at 450 550 650 750 850 and 950°C for 2 h. The clystal structure, microstructure, density, average grain sizes and electrical properties of the samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), the Archimedes method, a LCR impedance analyzer, respectively. The perovskite phases of BST and pyrochlore (BaCO3, SrCO3) were obtained after the calcination temperature of 550°C. The pure perovskite phases were found calcined temperature at 750°C of the X-ray diffraction. BST was in cubic structure, corresponding to JCPDS 34-0411. The microstructure of BST calcined powders were analyzed by a scanning electron microscope (SEM), the particle was spherical morphology and has agglomerates. The particle sizes were larger corresponding with the increase of calcinations temperature. So, this condition was used at 750 °C prepared to BST ceramic in all the samples. The XRD results of BST ceramics sintered at different temperatures (950 1050 1150 1250 and 1350 °C), showed the pure perovskite phases and 100% of the perovskite phase in all the samples. The microstructure of BST ceramics exhibited spherical morphology and has agglomerates. The particle sizes were larger corresponding with increase of sintering temperature. The average of particle size was about 0.12-4.2 µm. The shrinkage of BST ceramics with citric acid urea and glycine as the fuel increased with increasing sintering temperature. The density of BST ceramics increased with increasing sintering temperature after they decreased. The dielectric constant and dielectric loss of BST ceramics with citric acid, urea and glycine as the fuel measured at frequency of 1 kHz 10 kHz and 100 kHz. The dielectric constant increases and dielectric loss decreases with increasing sintering temperature. But the dielectric constant and dielectric loss decrease when the frequency increased. The maximum of dielectric constant by citric acid as the fuel sintered at 1350 °C frequency of 1 kHz, the maximum value 5577 and dielectric loss value 0.26.. "