uot;MARGIN: 0cm 0cm 0pt" class=MsoNormal>uot;FONT-FAMILY: ’Times New Roman’,’serif’; BACKGROUND: #f4f4f4; COLOR: #242424; FONT-SIZE: 9pt" lang=EN-US>This paper mainly discusses theory of ²⁰⁴Pb correction, sources and measuring method of ²⁰⁴Pb, and effect of ²⁰⁴Pb on the result. The study test indicates that the inaccurate measurement of ²⁰⁴Pb can drift age spots from the concordant line, making the average age higher or lower. In addition, the intensity of the primary beam, uniformity, shape of the beam spot, and raster time may also affect the measurement of common Pb. Due to the low content of ²⁰⁴Pb in most zircon samples, is more beneficial to scan the ²⁰⁴Pb peak at the fractures, the inclusions on high-uranium zircon, or the ²⁰⁴Pb-rich minerals, like feldbar. The peak position of ²⁰⁴Pb is usually slightly offset to the right of the peak center in order to avoid peak interference.uot;FONT-FAMILY: ’Times New Roman’,’serif’" lang=EN-US>uot;urn:schemas-microsoft-com:office:office" />