Abstract: Seventy and more excavated side slope, with the highness more than 10 metrers, have been formed along the arterial roads to the Baoquan Pumped Storage Power Plant. In certain sections, side slopes in medium and high size have been actually formed, and some even reached to a highness of 45 meters. According to the exposed geological instance after the excavation, techniques of PMS protection covering all the excavated side slopes are adopted for supporting purpose of ecological protection. The use of such technique in this construction area is just for the first time, and it can also be used or reference for the environment improvement, especially for city environmental geology.