A locking structure of a ceiling lamp for locking a ceiling lamp to a wire winding box comprises a retaining sheet locking to a bottom of a wire winding box and a plug inserting through the retaining sheet. A middle part of the retaining sheet has a positioning hole formed by overlapping a large size hole and a small size hole. A reed has a round buckling surface with a notch. The round buckling surface covers upon the large size hole. One end of the plug is locked with a nut. After the plug passing through the positioning hole of the retaining sheet from the large size hole to the small size hole, a lower end of the nut resisting against the small size hole of the positioning hole so that the plug is positioned to the retaining sheet.
This application is a continuation in part (CIP) of U.S. patent Ser. No. 10/452,864 filed at Jun. 3, 2003, which is assigned to and has the same inventor as the inventor of the present invention. Thus, the contents of U.S. patent Ser. No. 10/452,864 are incorporated into the present invention as a part of specification of the present invention.
