Abstract: To study the phenomena of the large-scale landslides in the event of time occurrence,this paper conducts some statistics on the time of distribution and induction factors about the large-scale landslide,which occurred in recent years in China. Observed from the statistics about the time distribution and the induction factor of large-scale landslides,the natural slopes often had the destruction under certain induction factors.However,the large-scale landslide occurrence in the time distribution is easy to be found around plenilune or meniscus.The specific time which occurs in one day presents the characteristic of normal distribution.Therefore,according to the earth tide theory,as well as the time corresponding relations between the tide-producing force and the landslide occurrence during one day,this paper suggests the earth tide is one of the factors which induce instability of large scale landslide.Because simultaneously the creep characteristic of different materials which compose landslide is different,which caused the large-scale landslide occurrence often to have in advance or the hysteresis.The above result has provided certain theory support for the landslide forecast or prevention.