The main contribution of Bičurin in the field of Chinese language, the Kitajskaja grammatika (1835), is still quite understudied, even though it represents the first grammar of Chinese written in Russian. Through a rapid overview of some of the early grammars of Chinese written by European authors and the analysis of some sections of the book, in which the Russian sinologist expounds the mechanism of Chinese, the paper dwells on the original ideas on this language developed by the Russian sinologist, inspired both by European and Chinese grammatical traditions. A particular attention is devoted to Bičurin’s concept of “mental modification”, related to the linguistic ideas discussed in Europe in the early 19th century.