In geography map , there is different energy density between linear objectives and background images . The target research analyzes the algorithm of energy density finding the weakness of it and puts forward a new method, linear search algorithm based on multiple templates , which is efficiently implemented for different ima-ges and the rules are also suitable for different templates and self-adaptive algorithm .Based on the results of the experiment , the method can extract the target pixel efficiently .%在地理图形中，线性特性目标的能量密度与背景图像的能量密度不同，根据这一特性，分析了基于能量密度对线性目标识别算法的不足，提出基于多个模板搜索目标算法，不同的模板应用不同的规则以及自适应的算法，通过仿真实验，该算法能较好地识别出地理图像的目标要素。
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