On the basis of hydrothermal synthesis of perovskite-type SrZrO3, SrZr1-xMxO3-alpha (M = Al, Ga, In, x less than or equal to 0.20) series oxides were prepared. The phase, particle morphology and dopant content of the product were characterized by the techniques such as XRD, SEM, Al-27-MASNMR, ICP and chemical analyses. The results indicated that the phase of product corresponded to orthorhombic perovskite-type SrZrO3, and the product had a particle size region which was 5-15 mu m. Elemental analyses showed that the products have the M/(Zr + M) (M = Al, Ga, In) ratio close to that of raw materials.