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On the basis of the PSRPOPPY software package, we developed an evolutionmodel of population synthesis for isolated radio pulsars by incorporating thefan beam model, an alternative radio emission beam model to the widely usedconal beam model. With proper choice of related models and parameters, wesuccesfully reproduced the observational distributions of Galactic longitude($l$) and latitude ($b$), spin period, period derivative, dispersion measureand 1.4-GHz flux density for the 1214 isolated pulsars discovered by the Parkesmultibeam and Swinburne pulsar surveys. The number of underlying population ofradio-loud pulsars is found to be $2.27\times10^6$, which is larger than theunderlying population of radio-loud pulsars simulated with conal beam model.The model is used to estimate the number of isolated radio pulsars detected bythe Galactic-plane pulsar survey with Five hundred-metre Aperture SphericalTelescope (FAST). Approximately 2700 and 240 new isolated pulsars are expectedto be discovered in the inner galactic plane ($20^{\circ} < l < 90^{\circ}$,$|b| < 10^{\circ}$) and the outer galactic plane ($150^{\circ} < l <210^{\circ}$, $|b| < 10^{\circ}$), respectively. These numbers are smaller thanthose estimated by the evolution models with conal beam and the snapshotmodels.

Role of Fan Beam Model in Population Synthesis of Isolated Radio Pulsars