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The evaluation of detection rate on aeromagnetic anomaly target is the preliminary work of aeromag- netic survey�� In order to find out a perfect combination of real- time measurement parameters and to realize a fast�� low- cost and high- efficiency exploration��this paper synthesizes the priori information about property parameters of target and practical survey conditions to calculate the theory model from the perspectives of profile map and contour map�� By analyzing the affecting factors in practice��it can be concluded that the approach of lowering altitude��im- proving the precision and signal- noise ratio of magnetic survey instrument can effectively enhance the target detec- tion rate�� Finally��a comprehensive quantitative result is achieved by analyzing the multi- model combination and calculating the probability of target detection��which can effectively avoid the blind zone in survey line design��