Abstract: The present work demonstrates numerically and experiemntally the pressure drop of three-phase gasoil-water-air flow with heating process in vertical pipe. The experimental work is contain a total of 70 runs are conducted for oil flow rate with range from 0.042 -0.316 m/sec with water flow rate between 0 and 0.53 m/sec and air velocity at range from 0.1757-0.703 m/sec. The water-phase is heating for four range of temperatures 25, 30, 35, 40 and 45°C. The three phases flow in vertical Perspex pipe of 3.175cm and overall length of 2 m. Gasoil, water and air are used as working fluids. The flow distribution and instantaneous pressure across pipe depending on water and air-gas oil velocities and temperature of three-phase flow. The numerical model is used to obtain the fluid flow characteristic. The governing equations like continuty, momentum and energy equations are solved numerically usng finite volume method. The results indicates that the pressure drop increases with increasing the gasoil-air superficial velocities for constant water velocity, also, pressure values increases with increasing water temperature. Pressure values are higher when the velocities of air-gasoil are lower because of the temperature translation from water-phase to another two-phases are higher. Also, the pressure increases with increasing water temperature and starts to decrease with increasing concentration of other phases. Pressure, temperature, density and phases distribution along pipe.