Plate falling film generator with film-inverting configuration is a new type of generator that combines the advautages of plate falling film generation and film-inverting technique.A mathematical model was built and calculations with it were carried out.By analyzing the section temperature and concentration distribution within the falling film,the characteristics of water vapor generation in generator were demonstrated.Effects on the generator performances of different inclined angles,inverting times and positions were compared.Under given conditions,an optimized design of a plate falling film generator with one-time film-inverting configuration was completed.The results show that the plate falling film generator with film-inverting configuration is more compact and has higher efficiency than the vertical plate falling film generator.