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Can anybody explain how to obtain surface phase diagram using VASP?

Thanks a lot

What is the meaning of "surface phase diagram "?

there is no vasp-specific feature about obtaining a surface diagram. you can do it as with any other ab-initio code.

e.g. have a look at Phys. Rev. B 68, 245409 (2003)

Here are some other papers using DFT to create a surface phase diagram.
Phys. Rev. B 64, 201322 (2001)
Phys. Rev. B 67, 115309 (2003)

For an example of "surface phase diagram" in equilibrium with a given external gas pressure at a given temperature: see e.g. Phys. Rev. B 69 (2004) 075421 and references therein. The fhi group is doing nice work in this direction.