Theoretical model for component-graded ferroelectric thin films is set up.In the framework of the Ginzburg-Landau-Denvonshire(GLD) theory,a distribution function is introduced to characterize the properties of graded components.With the variation of related parameter,film thickness and external electric field,the pyroelectric properties of component-graded ferroelectric thin films are mainly discussed.It's shown that the component gradient leads to the graded-polarization distribution in films.The related parameter and films thickness are two main factors to inflence the films properties.When the direction of the external electric field is opposite to the polarizations of components,the average polarization vs temperature curves present first-order phase transition type,which may have influence on film pyroelectric properties.