Book of Song
During this time, he spent much of his time writing. Two of his early works, "Zhenghe za ji" ("Mischellaneous Notes from Zhenghe) and "Xianling xiao lu" ("Minor Records of Magistrates"), are no longer extant. From the bibliography chapter of the "Book of Song" and Ming dynasty gazetteers of Quzhou, he is also known to have written a number of other books, all of which are also lost. Most of them were concerned with the administration of local and central government. At least one detailed ways in which the central government could improve its capacity to fend off the Jurchens who had seized north China in the Jin–Song wars.