In this study identification of overshooting tops in Convective Systems was assessed. To do this, Convective System occurred in 27 March 2007 was studied using Meteosat Second Generation imagery (High Rate SEVIRI Level 1.5 Image Data). Pre-processes such as calibration, geo-referencing and brightness temperature calculation was done using Envi software. Three OT detection methods, WV–IRW, CO2–IRW, O3-IRW brightness temperature difference (BTD) have been tested and compared with OT detection in visible images. Then the most appropriate BTD threshold was determined in any methods and areas identified as OT was compared in different methods. Using of lower brightness temperature difference threshold led to exaggeration of OT number and extension in all three methods, however they could identify all OTs. While using of higher threshold led to the method failed to identify many of OTs. Thus it was tried to determine the optimized thresholds that succeed to identify OTs as possible as and have the least false detection. Finally the thresholds was determined as follow: 3.1 for CO2-IRW, 3.5 for WV-IRW and 12 for O3-IRW. By these thresholds some OTs has not detected and some pixels has detected as OT falsely in all three methods, which was due to low spatial resolution. Results revealed while SEVIRI image and these methods has not enough to detection OTs precisely, but they are very useful to assess temporal and spatial as well their occurrence conditions.