Based on the feature analysis of multi-target in the long distance, a new multi-target recognition algorithm based on conformability degree is introduced in the cursory searching process and the precision searching process. In the cursory searching process, all possible targets are quickly searched with the round morphology template in the binary filtered image. When the cluster analysis of all possible targets based on the distance conformability degree principle is finished, the centroid of all possible targets in the same target is used as the center of a local entropy region. In the precision searching period of targets, the position of maximum entropy value is used as growing seed to implement region growing. In order to decrease computing quantity and improve real-time character of system, based on the entropy conformability degree principle, an improved algorithm of region growing which is the combination of the simple linking algorithm and the sub-region combination algorithm implements single target reconstrction.The simulation results show that the algorithm can perform recognition of five targets quickly and correctly.