A theoretical critical heat flux (CHF) prediction model is developed for the subcooled how boiling based on the liquid sublayer dryout mechanism. The model is tested over a large data bank (about 2482 points), which is characterized by covering almost the entire physics scope, showing a general good accuracy. Parametric trends of the CHF in terms of mass flux, pressure, subcooling, channel diameter and ratio of heated length to diameter an studied with the aim of not only indicating the trends, but also giving the theoretical interpret. The model also shows good adaptation to non-uniform heating, twist tape insert and non-water (nitrogen and refrigerant 113) system.