Abstract: Since nineteenth century, chemistry of forest precipitation was studied in foreign countries. The main purpose was to demonstrate the law of forest to reallocation transfer and pervasion of precipitation chemistry substance at that time. Late 1970', the research trend was to study the influence of air sedimentation and environment acidification to water quality of forest. The problem of forest water chemistry had become the focal point of forest water quality. The main several research aspects in forest water chemistry, specially air sedimentation ( mainly wet sedimentation), and woodland water environment were summarized.