The field morphology rating scale for evaluating pedological development according to Bilzi and Ciolkosz, (1977) was modified in the current study through suggestion of adding several important properties such as gravel contents for field morphology ratings and some chemical and physical properties such as salts, pH, calcium carbonate and gypsum for both Relative Horizon Distinctness (RHD) and Relative Profile Development (RPD). Adding a rating scale of diagnostic horizon for an average of relative profile development ratings (modified RPD) to compare between profiles development and evaluation of chronosequence of soils developed in aridic moisture regime. Application of field morphology rating scale and suggested modification on some soils of Western Nile Delta- Egypt, achieved the chronosequence, as well as, the diagnostic horizons of soils which belong to Aridisols order and have higher values of modified RPD than soils which belong to Entisols orders. So, these suggestions of rating scale with field morphological rating scale can be a useful tools for comparing pedological development of soils in arid climatic regime.