Contraposing the problem of galloping of iced bundled conductors ,a kind of analysis method of amplitude of galloping of iced bundled conductors is proposed from the relation between work and energy.The expression of amplitude increment of galloping of iced bundled conductors through a cycle is educed. The analysis process of amplitude of galloping of iced bundled conductors accord with engineering practice. The functions of linear item and nolinear item of aerodynamic force on iced bundled conductors in each section of galloping amplitude is explained clearly by the expression of amplitude increment of galloping of iced bundled conductors. The conclusion gotten from the expression of amplitude increment of galloping of iced bundled conductors are that galloping of iced bundled conductors is sprang by linear item of aerodynamic force and intensified by nolinear item of aerodynamic force.