The geology of loess in China involves many problems. This paper deals only with the basic ones of the or-igin of loess. the geologic setting and palaeoenvironmental evolution leading to the formation of the Loess Pla-teau. and the regional stratigraphy of loess deposits. particularly the last problem. A better knowledge of theformation and development of the loess deposits in China has been obtained through analysis and correlationof lithostratigraphy. biostratigraphy, magnetostratigraphy. climatostratigraphy and chronostratigraphy. The geology of loess in China involves many problems. This paper deals only with the basic ones of the or-igin of loess. The geologic setting and paeoenvironmental evolution leading to the formation of the Loess Pla-teau. And the regional stratigraphy of loess deposits A better knowledge of theformation and development of the loess deposits in China has been obtained through analysis and correlationof lithostratigraphy. biostratigraphy, magnetostratigraphy. climatostratigraphy and chronostratigraphy.