We kindly would like to acknowledge Professor Saidov A.S.(a former director of Institute of Zoology and Parasitology named after Pavlovsky E.N.,and the present vice president of Academy of Sciences of the Re-public of Tajikistan),who always supports us and was involved in arrangement of field trips during our joint project of collaborative research in Tajikistan.We would like to thank Askar Isabekov,a bird-watcher(owner of the birdwatching website:https://birds.kz/index.php and https://tajikistan.birds.watch),who provided us some bird's data of Tajikistan(353 occurrence data).We acknowledge Koblik E.A.(an ornithologist in Zoological Museum of Moscow State University.M.V.Lomonosova),for his comments,and ideas relating species checklist of Tajikistan.The first author would like to thank Manichanh Satdichanh and Bhattarai Prakash for some guidance and help during statistical an-alyses and also would like to acknowledge Chinese Academy of Sciences-The World Academy of Sciences(CAS-TWAS)President Fellowship Programme for providing scholarship to pursue Ph.D in the Ornitholog-ical Research Group at the Institute of Zoology,CAS.This work was funded by the National Science and Technology Major Project(2018ZX10101004),the Key Collaborative Research Program of the Alliance of International Science Organizations(ANSO-CR-KP-2020-04),Strategic Priority Research Program of the Chinese Academy of Sciences(XDA19050202). （a former director of Institute of Zoology and Parasitology named after Pavlovsky E.N.,and the present vice president of Academy of Sciences of the Re-public of Tajikistan）