Abstract: Shape and intensity distribution of X source spot are required for radiography image inversion, which need high accuracy. With the image experiment, information of source size, shape and intensity distribution can be reconstructed from the coded imaging of Gauss beam containing noise with accuracy of 5%. With direct simulation by Monte Carlo program, information of source intensity distribution was reconstructed from coded imaging of the source containing scattering interference, energy and angular distribution. Coded imaging method can be used for detecting X source spot feature at the same time of radiography image, which is advantaged to improve inversion accuracy of radiography image.