The satellite reflections at wave vector, q(0)=(0.5+delta,0,0) in the solid solution of Zr1-xSnxTiO4 ceramics have been studied by X-ray scattering. Incommensurate to commensurate phase transitions were observed in the vicinity of 845 degrees C, 820 degrees C, and 800 degrees C for ZrTiO4, Zr0.98Sn0.02TiO4 and Zr0.95Sn0.05TiO4, respectively. The temperature dependence of the incommensurate deviation factor delta was also obtained for ZrTiO4 and Zr0.95Sn0.05TiO4 and compared with Zr0.98Sn0.02TiO4.