X-ray sources at high repetition rate were obtained in the experiments of the ultra-short pulsed laser (<60 fs) interaction with different target elements. The wavelength range was from 1 to 15 nm. With the energy of the incident laser increasing, the intensities of X-rays emitted from different elements are enhanced. The element which has the highest emission of L band is different with that in the experiments of long-pulse lasers interaction with targets. A pinhole transmission grating and X-ray CCD were used as detectors in our experiments.