  High yield of strange particle production per central collision in
nucleus-nucleus collisions at RHIC and high statistics data set from STAR
experiment allow us to measure \Lambda\Lambda correlations. The \Lambda\Lambda
correlation measurement is also closely related to a possible six-quark state
H-dibaryon, which is yet to be observed experimentally. The first measurement
of \Lambda\Lambda correlations in Au+Au collisions for \sqrt{s_{NN}}= 39, 62.4
and 200 GeV and search for H-dibaryon with its weak decay \Lambda p\pi in Au+Au
collisions for \sqrt{s_{NN}}= 200 GeV using the STAR experiment at RHIC are
presented here.
