Abstract: Xi-Xian New Area is an important part of the economic development programs in Chinese government's plan, such as "The Belt and Road" and "The integration of Xi-Xian". A number of active faultsare developed surrounding this area, which bring apparent impact on civilians'daily life. The urban geological work is urgently needed to carry out, which can provide a certain geological guidance for the planning and construction of Xi-Xian New Area. In order to find out the exact distribution of these active faults, 15 radon monitor sections have been set out, and the distribution of active faults in Xi-Xian New Area has been analyzed and discussed through taking the soil radon monitor as the main detection method, and combining with the seismic sections, geological outcrop sections and other geological data. The results show that the Jing River Fault and the northern Wei River Fault are existed in this area. In which, the Jing River Fault is located under the Jing River Valley, while the northern Wei River Fault is situated at the area between the second and third terraces of Wei River. The Southern Wei River Fault and the Zao River fault are not existed in this area, and the details about these faults need to be further studied.