Recently

increasing research effort have been made on mini X-ray sources

which are of small size with high quality and low cost.Among them

a mini X-ray source based on bremsstrahlung is of better perspective.In this paper

we report our work on two kinds of bremsstrahlung mechanisms for mini X-ray sources.The photon production per electron of the X-ray production mechanisms are deduced and compared

so as to find the ways to improve them.Experiment on X-ray imaging with thin target bremsstrahlung was carried out to study the imaging quality and the influence on electron beam for the mini X-ray sources.