The three oriental hybrid lily cultivated varieties were used as experimental materials.The topsoil daily mean temperatures，timing accumulated temperatures and total accumulated temperatures under six covering materials were surveyed，and the flowering character index between overwintering bulb and cellar storage bulb were contrasted.The effect of different covering materials to overwinter safely for oriental hybrid lily was studied.The results showed that the straw+plastic film was the best covering material for safe overwintering.It provided a scientific basis of overwinter safely for oriental hybrid lily in Northeast China.