Based on the investigations of Thomson scattring of moving electrons in the presence of oncoming electromagnetic radiation, two new schemes for obtaining short wavelength electromagnetic radiation have been discussed. One of these is to use the harmonic polarized frequency up-shift by the nonlinear Thomson scattering of ultraintense circularly laser from the electrons with a certain velocity. Another is to use the Doppler frequency shift by the opposite direction scattering of ultraintense laser from the relativistic electrons.