A method of mounting a self-adhesive substrate on an electronic device comprising steps of: (S01) providing a base for mounting at least one self-adhesive substrate thereon, wherein each self-adhesive substrate includes a copper circuit layer formed thereon, an insulated adhering layer adhered with the copper circuit layer and made of glue with thermal conductive powders, and a release layer attached with the insulated adhering layer; (S02) forming the at least one self-adhesive substrate on the base based on a profile or a circuit configuration of a fixing portion of an accommodating member of an electronic device; (S03) welding a plurality of electronic elements on the copper circuit layer of each self-adhesive substrate; (S04) removing each self-adhesive substrate; (S05) removing the release layer from each self-adhesive substrate to adhere each self-adhesive substrate on the fixing portion of the accommodating member of the electronic device.