220kV Taiyuan-Tazhong electric transmission line entered the Takla Makan desert center, and passed by area covered aeolian sand. the ordinary cast-in-place reinforced concrete foundation use faced with some problems, for example the foundation matter transport intense, the water source deficient. Through the strength calculation and contrastive analysis of foundation materials, the assembly foundation which made up of the reinforced concrete plank and the steel bracket unify was a safe and economical choice. Assembly foundation prototype tests had been done in the engineering pass-by area, according to analysis on test results, proposed the foundation supporting capacity and the component strength calculation method, obtained some key design variables including uplift angle and horizontal load influence coefficient. This pattern foundation has been used in the engineering, indicated that use of assembly foundation saved 15% of the investment in cast-in-place foundation, reduced the construction time, had obtained good economy and social efficiency, and had provided the important reference for the similar project's application.