The ceramics La0.85Cr0.15TiOx and La0.7Cr0.3TiOx are prepared by conventional solid-state reaction method.The dielectric properties of Cr-doped LaTiOx as a function of frequency (0.1 kHz ≤ f ≤ 1 MHz) and temperature (77 K ≤ T ≤360 K) are studied.The blocks are then annealed in a flowing O2 or Ar/H2 to convert their oxygen content and the tests mentioned above are performed.The highly oxygenated samples exhibit extremely high low-frequency dielectric constants at room temperature (～106).The results show that the oxygen stoichiometry could significantly influence the dielectric properties of Cr-doped LaTiOx.