The present invention relates to a method for producing water for making tea beverages from deep seawater and a method for using the water for making tea beverages from deep seawater. More specifically, The present invention also relates to a method for preparing water for making tea beverages by modifying demineralized water and a method for using the water for making tea beverages.For this purpose, in the production of tea beverages according to the present invention, deep seawater is taken in water and warmed to 20 to 30 ° C so that subsequent treatment can be smoothly processed, and then subjected to sand filtration, microfiltration, ultrafiltration or nanofiltration A first desalting step for producing desalted water by performing a primary desalting treatment by one step selected from a pretreatment step of deep seawater and a deep seawater treatment by an electric extraction process or a freezing process； A second desalination step in which the pH is adjusted to a range of 9 to 11 by adding an alkaline agent and then sent to a reverse osmosis treatment step to produce filtered water from which a boron compound has been removed and a second desalination step in which the filtered water from which the boron compound has been removed is subjected to constant- A step of producing water for making tea beverage by modifying water to prepare tea beverage water； A has a feature.Deep sea water (deep sea water), water for making tea beverages, reverse osmosis treatment process, electric extraction process, refrigeration process, water modification process본 발명은 본 발명은 해양 심층수로부터 차 음료제조용수를 생산하는 방법과 이를 차 음료제조에 이용하는 방법에 관한 것으로, 더욱 상세하게는 해수면에서 수심 200m보다 깊은 해저심층의 해양 심층수를 탈염처리하여 생산된 탈염수를 개질 처리하여 차 음료제조용수를 만드는 방법과 이를 차 음료제조에 이용하는 방법에 관한 것이다.이를 위하여 본 발명은 차 음료제조에 있어서, 해양 심층수를 취수하여 후속처리를 원만하게 처리될 수 있도록 20∼30℃로 가온 처리한 다음, 모래여과, 정밀여과, 한외여과 또는 나노여과를 한가지 이상의 조합한 공정으로 여과를 하여 해양 심층수의 전처리단계와, 상기 처리된 해양 심층수는 전기추출공정 또는 냉동공정 중에서 선택된 한가지 공정에 의해서 1차 탈염처리하여 탈염수를 생산하는 1차 탈염단계와, 상기 탈염수에 알칼리(Alkal
