The stability of mountainous-area landslides is an important safty-issue which is always concerned about in the road slope disaster.The paper discuss the disadvantages of the traditional slope monitoring methods for mountainous-area landslides
the advantages of the new type technology based on GPS and introduces the GPS technology with high precision and suitable for monitoring displacement of mountainous-area landslides.The development of GPS positioning technique has provided a simple and reliable way in deformation monitoring of mountainous-area landslides and in other engineering applications.It is not restricted by the weather conditions
but has high degree of automation.The potential failure place of slope and the failure time can be predicted by the deformation monitoring by GPS.The practice indicates that GPS monitoring is reliable and it is better in operability and precision compared to traditional.It deserves being widely spread in the filed of slope deformation monitoring.