Using geomagnetic positioning and inertial navigation together to discover the precise location of the carrier is a new method developed in recent years. One of the key problems need to be resolved of this method is how to fulfill accurately geomagnetic match. This paper puts forward one new algorithm of making use of geomagnetic entropy and grey correlation analysis to solve this problem, first of all calculating the geomagnetic entropy value of the matched area, secondly according to the entropy of the geomagnetism choosing corresponding different grey correlation matching threshold, finally finding out the best match point and then determining the position of the carrier. This paper analyzes the theoretical base of the algorithm and proposes the practical implementation algorithm. Simulation results show that the speed of that algorithms is fast and the precision of matching is high, simultaneously which has the good resistance to the measurement error.%利用地磁定位和惯性导航来确定载体的准确位置的方法，是近年来发展起来的新技术。其关键问题之一是如何进行精确地磁匹配，为解决此问题，文章提出综合利用地磁熵及灰关联分析的新方法，即在计算出待匹配区域的地磁熵值的基础上，选择相应的灰关联匹配的阈值，从而找出最佳匹配点，进而确定载体位置。文章分析了该算法的理论基础并提出了具体的实现算法，经过仿真实验表明，此算法的运算速度快、匹配精度高、具有良好的抗测量误差干扰的能力。
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