In this work, we have investigated the effects on the electronicproperties of zig-zag (10,0) BN nanotubes interacting with FeCl3and CrO3by using the first principles calculation based on thedensity functional theory, considering different configurations. Wehave chosen these molecules because they can act as donor oracceptor of electrons depending on the environment they inter-act with, so you can modify the electronic properties of BNNTs.The results indicated that the interaction of the FeCl3and CrO3molecules outer BN nanotube surface are more favorable energetically and both molecules act as acceptors of electron, independentof whether they are outside or inside the BNNT. The binding energyfor more stable system shows that the FeCl3and CrO3moleculeinteracts strongly with BNNT.