In order to effectively restrain the strong nonlinearity of Doherty power amplifiers (DPA), an augmented general fractional order memory polynomial model (AGFMP) was proposed,and used to design a digital predistortion linearizer. AGFMP model was on the basis of general memory polynomial (GMP), removing a lag and replace even order items by fractional order items to reduce the number of parameters and improve the lianearization ability. The dual-band dual-mode signal （bandwidth up to 25 MHz） and 1000001 CDMA2000 signal were used as test signal, and DPA which designed with the peak power of 51 dBm was utilized as test power amplifier to do the linearize experiment. The experimental results showed that the numbers of the parameters of AGFMP are 30% less than GMP in terms of the strong memory effect and static nonlinear. Moreover, linearization ability of the AGFMP is very close to that of GMP. In addition, it is better than the fractional order memory polynomial for the suppression IMD out of band and in-band.
