Sunyaev-Zel’dovich effect in galaxy clusters

We review recent results of Sunyaev-Zel’dovich-effect (SZE) observations toward galaxy clusters. Using cm-wave receivers mounted on the OVRO and BIMA mm-wave arrays, we have obtained high signal-to-noise images of the effect for more than 25 clusters. Over 90% of these clusters are scheduled to be observed with AXAF during the first year of its observations. We present current estimates of cosmological parameters $H_0$ and ${\Omega }_m$ based on the SZE in galaxy clusters.