Abstract: The geological data including stratigraphic,lithological,petrographic,granulometric and geochemical of lithofaeies of Birmania basin have been studied for last ten years. These data were entered into specialized and data sheets of "Foxsedba" to establish data bank on Birmania basin. Graphs on x-y axis(for grain parameters and geochemical data)are constructed using "Harward Graphics". Interpretative environmental model of various lithofacies of the basin are prepared using "Image" software. Finally,the aforesaid data are interpreted to infer the environ-ments of sedimentation of the various lithofacies of Birmania basin. The sedimentary fill of Bir-mania basin comprising a mixed assemblages of siliciclastic,carbonate and phosphorite facies in-dicate highly fluctuating sedimentary milieu viz:there were several events of depositional re-gression with intermittent events of transgression. As a consequence phosphorite formed essen-tially as a complex assemblage of shallow water orthochemical and allochemical sediments.