how to find PSRR for this Circuit ?

Add AC source in series with DC and do AC analyse with DC operating point ?!? Or do transient analysis.

but i think this will give gain and phase graph how can we define PSR from that

PSRR is the ratio of supply ripple amplitude vs output amplitude, so it's just the gain of Vcc / Vout, it is usually expressed in dB. Voltage regulators should have a high positive PSRR (in dB), large variations in Vcc should produce small variations on Vout. PSRR of course depends on frequency. For example, some regulators are very good at filtering out low frequency supply variations, but less effective at high frequency ripple components.

Hi all , how to check noise for above LDO circuit ?