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To process tracking low-altitude targets with the multipath propagation is a difficult task. The difficulty derives from a large number of uncertain knowledge (parameters) such as the radar waveform frequency, the specific signal processing, the surface reflectivity, and the actual target elevation and range, ... etc. This paper offers a technique based on the fuzzy logic to solve the uncertain measurement error by the multipath propagation. And we apply the quantitative analysis presenting the degree of multipath effect to achieve the goal we mentioned ahead. Meanwhile, the tracking filter estimation is used to reduce the measurement error by the multipath propagation. After the simulation, the fuzzy-logic-base technique not only can simplify the process of the model building by IMM but also can promote the tracking accuracy.