Photo-energymeter with high sensitivity, fine frequency and fast response has been developed with, pyroelectric material. The parameters of the calorimeter are calculated. The energies of both laser at wavelength 1.06μm and 0.53μm, and soft x-ray ranging from 0.lkeV to 10keV are measured. The sensitivity is about 300mV/μJ and the time response is less than 2ns.