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I am calculating the PDOS. I have tried different values for RWIGS but cannot make the Volume of Typ close to 100%. I have tried the vlaues in the POTCAR, the covalent radius from theperiodic table and half of the distance of nearest neighbours, but the volume of Typ keep at a very low value.

Here is a Typical eaxmple:
Volume of Typ 1: 30.4%
Volume of Typ 2: 28.8%
Volume of Typ 3: 12.3%

Can anyone give me a reason?

Thanks

Because of the overlapping between atoms

problem is how to improve the volume close to 100%

It is simple academic exercise. You have volume of the supercell and RWIGS, and you must solve equation like: V = a^3 * 4/3 * pi *(sum [N_i * RWIG_i^3]), where N_i and RWIG_i are number and radius of appropriate atom kind, respectively. a is wonted scaling factor of all RWIG_i defined in INCAR file.