Abstract: According to the basic principle of detrended fluctuation analysis（DFA)，this paper researches the fractal scaling property of measured sea clutter data with two different bands under nonstationary conditions，as well as the influence of ocean environment parameters on the analysis results.Firstly，with the methods of variation mean/variance between different data segments，random walk model and logarithm variance verse scale etc.〖KG-*5〗，the properties of sea clutter such as nonstationary，fractal and long range correlations are qualitatively justified.The scaling exponent property of sea clutter and targets bins is then analyzed within different scale ranges by making use of the double logarithm fluctuation function verse scale curves worked out by DFA.The research results of scaling crossover phenomenon shows that it is caused by the discrepancy in correlation properties of sea clutter at different scales，and the discrepancy is more prominent for VV polarized data.When sea state changes，the changing trend of scaling exponents in different scale ranges is closely related to polarization patterns.Finally，the fit error is chosen as detection statistics to validate the application of analysis results in the field of target detection algorithm.