For the deficiency of great subjectivity in traditional AHP method, the least squares regression method is used to analyze factor index influence degree of maintenance quality from the fractal angle, and establish the analysis model of index influence about equipment maintenance quality based on fractal theory. Establish influence factor index system of maintenance quality. And the maintenance quality fractal dimensions of every review stage are acquired based on the standardized data afterward. Then the regression equation is educed with the least squares method. At last, the Pareto picture is drawn.