 The output of the nanogenerator is associated with the piezoelectric coefficient and the thermal deformation of the materials.The output current I of the pyroelectric nanogenerators can be determined by the equation of I=pA(dT/dt), where p is the pyroelectric coefficient, A is the effective area of the NG, dT/dt is the rate of change in temperature.Pyroelectric nanogenerator is expected to be applied for various applications where the time-dependent temperature fluctuation exists.