Most of landslides occurred because of the action of water. Dynamics of groundwater is directly related to the stability of landslide. Change of groundwater level is one of the most important factors of landslide prediction. In this paper, We used waterclocks to monitor groundwater level of K144 landslide for two years and found that different slope regions of the groundwater level showed different variation. Groundwater level of unstable region changes between 4m ~ 6m in the sandy mudstone area where average precipitations is about 1000 mm, which were the same trend with the monthly total rainfall changing; groundwater level of stable area changes around 1.5m, which was unobvious in response to the monthly accumulative rainfall; the rise of groundwater level is the important reasons for the K144 landslide sliding.