PAN lang=EN-US>Based on the data of gravity and aemmagnetic anomalies and their processing results （Tilt derivative and Euler deconvolu- tion）, the authors re-explained the fault structures and reek mass in the Gobi desert area in eastern Tianshan Mountains and analyzed the structure framework of eastern Tianshan Mountains in details in combination with rock density and magnetic characteristics as well as the previous research results. It was concluded that the direction of the main tectonic line for eastern Tianshan Mountains was EW strike and characteristic of north south zoning; the intensive gravity gradient belt was correspondent to level one fracture on the map of gravity and aeromagnetie anomalies. Through the process of Tilt derivative and Euler deconvolution, the weak information of gravity and aeromagnetic anomalies were intensified and some new fracture structures and rock mass were identified.
