Hi  sir ,
 
I used StrucTools server of Area/Volume from Web to calculate the buried surface of ligand .
The ligand and protein was docked with glide , and then, i saved the complex into the form of
pdb.I calculate the protein, ligand and complex area respectively , but the values of protein
and complex were the same . The Surface probe size is 1.5 and Atoms to use is 'atoms+hetatms' . 
Is there something wrong with the pdb file of the complex or my operation?
 
Thanks,
Sweety