Shanghai Library is in charge of the compilation（n.編譯，編輯） of the comprehensive family tree, and the project has already taken them nearly 7 years.

 "It will be the most inclusive（a.包括一切(費用,時間等在內(nèi))的） Chinese family tree ever when completed, comprising（vt.包含，包括，由…組成；構(gòu)成，組成） nearly all the genealogies（n.家系，宗譜） we collected in China," said Wang Heming, the chief editor of the comprehensive family tree.

 Statistics shows that there are some 18,000 genealogies preserved in Shanghai, 10,234 in Taiwan and 8,102 in Beijing. The comprehensive family tree also covers 47,000 genealogies from abroad. "There will be approximately 70,000 entries（n.登記，條目） of 10 million Chinese characters in the work, and all the books will be nearly 50 cm tall when piled up," said Wang.

 Currently, the editors are verifying （vt.核實，查對；證明，證實）the authenticity（n.真實性） of the data they collected, and removing duplicated entries, to make this encyclopedia of Chinese families perfect.

 It can be estimated that the comprehensive family tree will provide important information for researchers in the field of history, economics, demography（n.人口統(tǒng)計學）, folklore（n.民俗學，民間傳說） and education science.

 The history and reality of 643 Chinese surnames can be found in the comprehensive family tree, 205 more than the classical "Bai Jia Xing" (Chinese surnames), and there are more than 2,000 entries for Chen, Zhang, Wang, Liu and Li families, more than 1,000 entries for Huang, Yang, Wu, Zhou, Lin and Xu families.