In this research, observational data are analyzed to explain temperature and salinity inversions and double diffusion in the Oman Sea. The results of this paper show that intrusive structures extend over a depth of about 100-450 meters in the Oman Sea. Temperature and salinity inversions observed depth of 250 m in winter and summer in the Oman Sea. Steps thickness is about 10 to 20 meters. A warm and saline lens in these waters with common diffusive convection on the top layers and salt fingering in bottom layers are expected. Both processes occur (diffusive and finger convection) that have an important role in creating temperature and salinity inversions. Convective diffusion is the dominant factor in dual diffusion in the steady-state. While the warm and saline tongue expands due to the salt fingering and the baroclinicity, Convective diffusion is a major factor limiting the growth of tongues.