Abstract: In this paper, a set of data collection and magnetic deviation analysis experiments which can simulate different magnetic disturbances are designed based on ellipse-specific fitting error compensation method. Under the condition of diverse magnetic disturbances, ellipse parameter which depict measured data characteristic and the last compensation effect are analyzed in detail. Theoretics expressions are compared and complemented with experiment results. At the same time, the interaction of soft iron and hard iron distortion and the role of each in the whole magnetic heading error are discussed.