Abstract: Nowadays, the increase volume of Spams has been annoying for the internet users. In the recent years, the applying of machine learning techniques has attracted many researches’ attention for automatic filtering of Spams. In this article, a system of spam filtering has been presented based on Adaboost algorithm. In the proposed method, the available terms in email have been used as the basic features in classifying email issues. That is why the feature selection has an important role in effective improvement of Spam filtering In the proposed filtering system, a compound method has been used to identify related features and remove unrelated features, and the results have been tested and compared on a standard data set of Ling-Spam. Finally, to compare the obtained results, several other algorithms have been applied on the data and their results are compared with the obtained results. The results of the experiments clear the fact that this system has an acceptable efficiency about 0,983.