Purpose: International Society of Dacryology held the IV International Congress in Stock -hohm on June 1996. I was warmly invited as a guest of honor beforehand to deliver a lecture on a special topic of “Dacryology in China” there, so that the world might understand the dacryology in China, and thus the international growth of dacryology as a discipline would be promoted.Methods: In China tear lab research and clinical research of LG are nearly empty except a few papers published. We had studied 3 items on LS for 28 years before 1979, and put our attention mainly on dacryology since 1979 by 3 stages: (1) collecting literatures( 1979-81) ; (2) lab research(1981-84) and (3) clinical research, put DE as the key point by 4 steps: DE diagnosis(1984-86); DE treatment (1987-91); DE Condition Judgement(1989-92) & DE cause & mechanism( 1991-95).Results: In the past 44 years, esp. from 1979 on, in a planned way, we have systematically researched the dacryology with main results below; created new word “Leiyexue” Purpose: International Society of Dacryology held the IV International Congress in Stock-hohm on June 1996. I was warmly invited as a guest of honor beforehand to deliver a lecture on a special topic of “Dacryology in China ” there, so that the world might understand the dacryology in China, and thus the international growth of dacryology as a discipline would be promoted. Methods: In China tear lab research and clinical research of LG are nearly empty except a few papers published. We had studied 3 items on LS for 28 years before 1979, and put our attention mainly on dacryology since 1979 by 3 stages: (1) collecting literatures (1979-81); (2) lab research The key point by 4 steps: DE diagnosis (1984-86); DE treatment (1987-91); DE Condition Judgment (1989-92) & DE cause & mechanism (1991-95). Results: In the past 44 years, esp. from 1979 on, in a planned way, we have systematically researched the dacryology with main results below; created new word “Leiyexue ”