Pb-Li alloy is one of the most promising candidate for its application as liquid blanket. At low temperature, Pb-Li has a derivative rhombohedral structure and at high temperatures it has CsCl type structure. In the present paper, finite temperature thermophysical properties of CsCl (B2) type Pb-Li is reported using density functional theory in conjunction with quasi harmonic Debye model. Results are discussed in the light of available experimental results.