An improved drop segmentation algorithm is proposed for touching character in the mixed character and image typesetting document whose segmentation accuracy is not high with the traditional algorithm.This method uses simple Bayes Classifier to distinguish the character types and use adhesion threshold to judge the existence of character touching.The possible cut points of the touching characters are located by analyzing the extreme values of character contours,and axis of stroke connection between two characters is extracted by distance transform.Finally,the path determined by extreme points and the centerline are used as the drop fall algorithm′s segmentation path to complete the segmentation of the characters.Experimental results show that this method is effective to choose the starting position of the drop fall algorithm and to solve the damage problem of the characters.The method can highly improved the segmentation accuracy.