Due to historical reasons and some man-made factors, most of Zheng's genealogies in different periods have not been preserved. Genealogy holders generally follow the family rule of "keeping their mouths shut". In addition, after the new genealogy is compiled, all the old genealogies should be destroyed except one or two kept in ancestral temples at home and abroad, so as to avoid outflow and black sheep being sold to others. Undoubtedly, this is also the main reason why Zheng Jiapu is not easy to be known in the process of circulation and preservation. In addition, there are some rules about preserving genealogy in the family rules and laws compiled by some people named Zheng themselves. For example, it is clearly stipulated in the Regulations on Changshitang of the Zheng family in Xishan that "if a clan sells its clan without choosing its pedigree, the clan leader shall not be driven out of the ancestral temple except being punished by the gentry, and if there is a private pedigree, it shall be reported to the official for investigation", which has strict restrictions on the preservation of the genealogy. Therefore, although Zheng's surname has been constantly revised and continued in history, there are not many that can really be preserved today, especially the knowledge known by the world is very limited. According to the genealogy of Zheng collected by libraries and genealogy data collection centers at home and abroad, as well as the number of known genealogy preserved by clan associations, research associations or individuals, there are only about 50 copies, and most of them were compiled during the Ming and Qing Dynasties and the Republic of China, which is obviously not enough to reflect the whole picture of Zheng's genealogy and is far from the actual Zheng's genealogy.

At present, the known genealogy of Zheng surname before Ming dynasty has not been preserved, and what we can see is mostly the genealogy of Qing dynasty and Republic of China. However, these genealogies are all related to the contents before the Ming Dynasty, and some of them were rebuilt or updated before, so more previous contents were retained. For example, the genealogy of the Zheng family in Yimen, Pujiang was originally compiled on the basis of the genealogy before the Southern Song Dynasty, including the preface of Ouyang Xiu, Zhu and others in the Song Dynasty, but it was destroyed by war at the end of the Song Dynasty and the beginning of the Yuan Dynasty and was not rebuilt until the middle of the Yuan Dynasty. Later, in the Ming and Qing Dynasties and the Republic of China, it was repeated for 14 times, becoming a complete family tree. This practice of constant revision and supplement is of universal significance in Zheng Jiapu.

At present, Zheng Jiapu, which is preserved in the hands of different institutions and individuals at home and abroad, mainly includes:

Genealogy of Zheng Family in Pujiang of Ming Dynasty, Genealogy of Zheng Family in Ishii, Genealogy of Zhang An, Genealogy of Zheng Family in Baoshan of Qing Dynasty, Genealogy of Zheng Family in Yunyang of Piaoyi Ancient Yao, Genealogy of Zheng Family in Yimen, Genealogy of Zheng Family in Pucheng, Genealogy of Zheng Family in Nanhu, Genealogy of Zheng Family in Ciyi Irrigation, and Genealogy of Zheng Family in Taikang