The breeding behaviour and the advertisement calls of the giant tree frog, Rhacophorus maximus was studied during the breeding season in Mizoram University Campus, Aizawl, Mizoram. At the first shower of the onset of monsoon, advertisement calls of male attract females to breeding areas and announce other males that a given territory is occupied. The aim of this study was to provide the detailed information on the breeding behaviour and analysis of advertisement calls of Rhacophorus maximus. Advertisement calls were emitted in series with variable call intervals. The morphometric measurement of the amplecting pairs were recorded and females are found to be larger than males. Key words: Breeding behaviour, advertisement calls, Rhacophorus maximus, Mizoram.