Gu Haiying is a Chinese author whose name appears on the title page of a medical professional book. Public information about the author is limited: it can currently be confirmed only that Gu is associated with Modern Sanitary Chemistry (3rd Edition), a work classified under medicine. Judging from the title and edition, the book is a higher-education textbook or professional reference in sanitary chemistry, intended for teaching and laboratory work in sanitary inspection, preventive medicine, and related fields. That it has been revised and reissued suggests a certain level of use in relevant courses and among specialist readers. Gu's writing and editorial work thus show a distinctly textbook character, emphasizing basic concepts, methodological systems, and standardized表述 rather than popular reading for a general audience. Because the database contains only this one work and records no birth or death dates, education, or positions, further details of Gu's personal and academic background cannot yet be given and await more public information.