The order-disorder transitions in tin modified zirconium titanate were investigated using high temperature X-ray, dielectric constant, DSC and DTA. In the low concentration of Sn (x<0.2) in Zr 1 - x Sn x TiO 4 , the superlattice reflection, dielectric anomalies, thermal anomalies and specific heat anomalies clarified that the successive order-disorder transition occurred around the temperatures of 1117°C and of 1125°C on cooling and on heating, respectively. Furthermore, the superlattice reflection intensity was proportional to the enthalpy, but inversely proportional to the cooling rate, c-axis lattice parameter, and Sn content (x). For the composition of Zr 0 . 8 Sn 0 . 2 TiO 4 , the order-disorder transition was completely inhibited.