In this paper, the authors introduce a modified version of anti-binary collision algorithm. The proposed method enhances data collision problems done among multiple tags in the range of the RFID reader's action. The proposed algorithm is called Modified Adaptive Binary Splitting protocol (MABS). It is one blocking protocol, based on adaptive binary splitting protocol. MABS not only inherits the essence of ABS which uses the information of recognized tags obtained from the last process of tag identification, but also adopts a blocking technique which prevents recognized tags from being collided by unrecognized tags.