Trace fossils are abundant in Precambrian strata of China.Some found before the glacial age of Precambrian are distributed mainly in Changcheng System and Qingbaikou System of North China.The old geological age of these trace fossils shows that some metazoans might live in the old sea of North China before 1400～1700Ma.Their discovery is of great significance for further understanding of the origin and early evolution of metazoan.The trace fossils found after the glacial age of Precambrian are widely distributed in Late Sinian of Southwestern China.They may furnish important evidences for division and correlation of Sinian and the boundary of Sinian-Cambrian.