X-ray to light convertor in a real time radiography image formation system plays an important role. A new type of Tb3＋-doped silicate luminescent glass has been developed recently. It can take the place of traditional rare earth fluorescent screen in high energy radiography applications because of no visible light dispersion in it. For its spatial resolution will not greatly reduce when its thickness increases within a certain range, a thicker glass can be used in order to reach a higher DQE. The luminescent glass can be used in a radiography image formation system which adopt a high energy X-ray source up to 30 MeV. The spatial resolution is about the same as 301 type luminescent glass excited by 100 keV X-ray and the spatial resolution may not be less than 1.5 lp/mm when excited by 12 MeV X-ray. Its luminescence intensity is about 3 times of 301 type. Some effects on its characters of main ingredient materials (BaO, Cs2O, Tb2O3, Gd2O3, Ce2O3) are also researched in the way of changing the mass percentage and appropriate ingredient configuration for high performance is derived. Optical performances are tested and results are given out.