This article is a diagnostic study and it is the 2nd in a series of scientific articles which study the environmental factors that affect the archaeological buildings all over the country. The current research aims at studying the Nektenebo II temple in Bahbit El-Hagar, which is considered one of the most important archeological sites in Pharaonic Egypt. It was chosen to assess and evaluate the deterioration conditions which affect its components. The temple suffers from aggressive harmful deterioration appearance resulted from severe seismic actions, especially earthquakes and un-stable lands that destroyed it completely. So, the site was investigated through applying some scientific techniques in order to check their decay conditions and define the most suitable conservation approaches that will be recommended. In addition, the study investigates some samples collected from this monumental site through using some specific techniques such as CICS, XRD and SEM-EDX. The results proved that the essential deterioration appearances dominated in the study area are mechanical destroying (cracks and micro fissures), in addition to other deteriorated symptoms such as salt crystallization, soiling and crusting, and crumbling and scaling