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[shinekin@hotmail.com]

hi Lan,
 thanks for your reply, but i just want to know how to calculate the bands 
within 1 or 2 eV around the fermi level, i mean that other band could be 
neglect.

certainly 'nband' can specify the numbers of bands i want to calculate,but i 
found that abinit generates eigenvalues in a order from the low to high enery 
according to the corresponding valence states. for instance, if the valence 
states that abinit considers is 2d3s3p and the 'naband' was set to be 1,then 
just 1 band of 2d state will be calculated because of the 2d state locates at 
the lowest energy, in my question, how to set parameters so that abinit can 
just calculates the band which locates at the higher energy levels in a 
single band structure calculation? 

       Regards
Shinekin