Dear Rahman

>Could you plz let me know why I am facing this problem whenever I try the
>band structure of any material and I will have these crossing lines.

Maybe, you can get ride of these crossing lines by using :

no_overlap=.true.

option in the inbut of bands.x . Please see
http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_BANDS.html and
http://www.quantum-espresso.org/wp-content/uploads/Doc/pp_user_guide/node7.html
for more detail.

Kind regards

-- 
PhD student
Department of Physics
Sharif University of Technology
Tehran, Islamic Republic of Iran
email:mohammadsandoghchi at gmail dot com
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