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.