Detrended fluctuation analysis (DFA) has the property of filtering the trend component of each order and the crossover can express the change of the trend background field. The authors use the DFA to analyze the mobile leveling cross-fault deformations in northeastern margin of the Tibetan plateau. These cross-fault sites are located in Qilianshan fault zone and haiyuan fault zone and the original observation curves don't express the structural information and the seismic information. The result show that detrended fluctuation analysis cover can reflect the precursory abnormity of Ms4.0 earthquake around the sites better and improve the efficiency of leveling across-fault data.%将去趋势波动分析方法引入流动跨断层观测资料的处理分析，利用去趋势波动分析方法能够滤去各阶趋势成分，其折点能够反应趋势背景场变化的特点，对东北缘地区祁连山断裂和海原断裂带的流动跨断层场地中原始观测曲线反应构造信息和孕震信息较差的跨断层测段进行处理，所得结果显示跨断层去趋势波动曲线能够对场地周围4级以上地震的前兆异常有较好反应，使用该方法可以在一定程度上提高对跨断层成果的利用效率。
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