Based on the analysis of the engineering geological conditions in Qinghai Province, the application feasibility and key technology of micropiles for transmission tower are studied. It is shown that soft ground is mainly located in alkaline land with a strong salt corrosion, and there are not good corrosion protection measures for micropiles foundation, so micropiles foundation is not suitable in soft ground. However, micropiles foundation have many economic and environmental benefits in loess ground. Therefore, the type and key technology of micropiles foundation in loess ground are analyzed, and the economy of micropiles foundation in loess ground is evaluated by example calculation.