Abstract: First, this paper briefly introduces construction and principle of the inclinometer, analyzes the main factors which cause inclinometer produce deviation. Then, take landslide monitoring project in Huale as an example explain application of inclinometer in monitoring landslide project. Though monitoring the five key points distributed in different locations and gathering all monitoring-data half month as a period, handle monitoring-data to get depth-displacement bight followed with time of each monitor point so that we can comparatively and clearly master situation of landslides in each interval short time. Finally, we can provide important basis and objective advice for administer landslide through analyze the change regulation of depth-displacement bight.