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A novel division-of-wave-front photopolarimeter for simultaneously measuring the polarization state of light is described.An incident light beam is divided by a composite beam splitter into four branches which are then detected by four independent detecting units respectively.The measured signal values from the four detecting units are used to form a signal vector.The instrument matrix of the system is obtained by calibration experiment.The Stokes vector describing the polarization state of an incident light is obtained by the matrix calculation by using the signal vector and the instrument matrix.The calculated result for an incident light is in good agreement with the measurement.