Abstract: The application of Mossbauer spectroscopy, especcially in situ MÕssbauer study to heterogeneous catalysis has received more attention in recent years.Some information have been got on several important topics in catalysis,such as metal-support interaction,cluster formation on solid surface,characterization and identification of the active phase,promo-tive and poisoning effects, adsorption centers in zeolites etc.In this paper works concerning the above mentioned topics, mostly presented during the last decade were briefly reviewed.