This invention relates to one X ray infraction optical element high resolution rate self-supportive cast transparent grating, which comprises the following: a, depositing film gold layer to support X ray mask underlay; b, in surface layer etching electron glue to get etch pattern; c, the slice is put to coating liquid for X ray mode absorptive gold pattern; d, the said slice removes electron beam glue; e, then removing electron beam for film of chromium layer; f, coating medlin on glass for fixing; g, depositing gold on its surface; h, coating X ray etch glue on gold surface; I, removing medlin; j, removing etch glue; k, back surface erosion of glass to fulfill the process.