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The performance of a compact position sensitive gamma-ray detector based on wavelength-shifting fibers coupled to YAlO3:Ce scintillation crystal was evaluated using a Monte-Carlo simulation method.The simulation model has been setup using the GEANT4 codes.Compared with the gamma-ray detector based on the YAlO3:Ce scintillation crystal coupled to Hamamastu R2486 position sensitive photomultiplier tube.the results indicate that the gamma-ray detector based on wavelength-shifting fibers readout has good position linearity,good spatial resolution and larger effective field of view.The image and point spread function of measured point were presented.The spatial resolution reaponse as a function of position was obtained.The factors influencing spatial resolution and position linearity were discussed.