Jiangxi Chengzhu Environmental Engineering Co., Ltd. has joined in Crossref database as a research instituite, becoming a membership. Each of the journal articles or book sponsored by our company is registered with unique DOI prefix (DOI prefix 10.58473), which can be retrieved in official database and allowed to participate in the academic statistics in citations. Since then, the international academic journals (Hong Kong) sponsored by our company have been more in line with international standards.