To select the leaders of public opinion in web BBS, who greatly influenced the direction of public opinion in Internet, the characteristics of the participators in web topic discussion were analyzed to build a model. An attribute matrix of the leaders was established based on their characteristics, such as eloquence, impact, activity and insistence. The grades of the characteristics reflected the leadership distinctly. Then, the synthetical evaluation and sort-order algorithm of the leaders in the model were given. An instance was presented to demonstrate the use of the model, including the steps and calculation.
