The sensitivity of boron nitride nanotube (BNNT) to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is investigated by M06-2X/6-31++G**. There are different locations on BNNT to close and interact with the TCDD. In this study, the thermodynamic and electric properties, quantitative structure-activity relationship (QSAR), HOMO-LUMO energy, and other parameters are calculated for all these probabilities. The results show, the BNNTs (12, 0) can be used as nano-sensors and nano-filtration to reduce and eliminate the TCDD.