Information released in this present book relates to the changes in tray geometry and CFD modeling of distillation column tray. It can be describe briefly as follow: Modeling of the distillation column tray has great importance, it relates the geometrical parameters and operational conditions to the efficiency. CFD is powerful tool, because, it prepares the reliable results to predict the system behavior regardless of the geometry and operating conditions. In this study some previous modeling about sieve and valve tray are considered in the hydrodynamic and mass transfer aspects .Some experimental studies have been pointed in continuous.