Late Ming and early Qing dynasty. According to the query of the World Wide Web, Liu's biographical geography book, 140 pages, was written in the late Ming and early Qing dynasties. Liu Jia Zang Tong Jian is the only Tong Jian registered by the State Trademark Office in Jiangxi Province. It is sold all over the country every year, and the sales volume is increasing year by year. After 37 generations' inheritance, Liu's Collection of Letters from Home has been carried forward and benefited the public. After its publication, it has had a great response in the field of geomantic omen.