A new polarization synthesizer is presented,which can realize arbitrary state of polarization(SOP) output light.The polarization synthesizer,whose operating wavelength is 1 550 nm,consists of a linear polarizer,a rotatable quarter-waveplate and a rotatable halfwaveplate.The operating principles and controlling algorithms for this polarization synthesizer are also derived from 2-dimensional geometry methods.The experimental results show that the polarization synthesizer can generate arbitrary,high accurate SOP output light.This polarization synthesizer can be used in the field of testing the impact of polarization related effects on optical components and on optical fiber communication systems.