In order to clarify the inhibitory effect of LZO on the oxidation of bond-coat in thermal barrier coatings (TBCs), NiCoCrAlY bond-coat was deposited on 310S substrate by Detonation gun spraying, and single ceramic 8YSZ coating and LZO/8YSZ double ceramic coating were deposited by air plasma spraying technology. The microstructure and phase structure of TBCs before and after high temperature oxidation were analyzed by SEM, EDS and XRD. The results showed that the relative oxidation weight gain of the double ceramic LZO/8YSZ and the single ceramic 8YSZ structure was 2.82 mg/cm2 and 3.13 mg/cm2, respectively. Corresponding the TGO growth rate constant Kp was 5.79 ×10- 2 μm2 / h and 6.26×10- 2 μm2 / h, respectively. And the corresponding thickness distribution range was 3.75-5.25 μm and 5-5.5 μm, respectively after isothermal oxidation (100 hours) at 1100 °C. Compared with the single ceramic 8YSZ TBCs, TGO exhibited obvious characteristics were less oxidation weight gain, low growth rate, and slow β phase transition in bond-coat of the LZO/8YSZ double ceramic TBCs.