Abstract: An improved theory of linear amplification with nonlinear components(LINC) is proposed. Input RF signal is separated into envelope component and constant envelope anglemodulated component. Two branches of constant envelope anglemodulated component phase modulated by envelope component respectively and conversely are converted frequency and amplified. The amplified upconverted input signal is achieved through a subtracting circuit. Because the amplification of constant envelope signal can be carried on without distortion in nonlinear region, the whole work efficiency is high. Power gain of LINC amplifier is derived as KG/Em and simulation of the circuit is operated and analyzed. The prospect of theoretical amplification effect is realized and high power efficiency is obtained.