Production of $\Lambda$ and $\bar{\Lambda}$ particles in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The measurements of $\Lambda$ and $\bar{\Lambda}$ particles are crucial to study the net baryon density and strangeness production in relativistic heavy ion collisions. The PHENIX experiment at RHIC has recorded 1.5 $\times$ $10^{9}$ Au+Au events during 2003-4 run period at RHIC. The data sample will allow us to make a detailed study of the centrality dependence of $\Lambda$ and $\bar{\Lambda}$ yields. We shall present the analysis status of the $\Lambda$ and $\bar{\Lambda}$'s.