This article is a review of the book "A Reference Grammar of Longchuan Achang" by Shi Jian. The book provides a comprehensive analysis of the phonology, word classes, morphosyntax, and discourse structure of the Husa dialect of Achang spoken in Longchuan county, Yunnan province, China. It is noted that this work is an improvement over a previous grammatical sketch of Achang by Dai Qingxia. The book covers various aspects of Achang language, including phonology, word formation, syntax, and provides natural data collected from fieldwork. Overall, the book is considered a valuable resource for the study of Achang and related languages in the Tibeto-Burman branch. [Extracted from the article]