Abstract: Falling film evaporator(FFE)is a kind of effective,energy-saving evaporating equipment,while the calculation of the heat transfer coefficient is not as accurate as is expected,which is partially due to neglecting the impact of distributor on heat transfer in FFE.For this purpose,a coefficient named Distributor Influence Coefficient is introduced which enable us to get the heat transfer coefficient form a new point of view.It is carried out with a new-type distributor——Umbrella Distributor,and furthermore,the influence of various factors is analyzed,which provides new thoughts for the calculation of heat transfer coefficient in the practical design.