Black tea is a post-fermented tea made from tea, which is processed by the process of killing, smashing, smashing and drying. It is rich in various beneficial elements such as K, Ca, Mg, Zn, etc. It is a supplement in the space flight. Excellent ingredients with a variety of elements. In order to investigate the element elution characteristics during the black tea soaking process, the content of black tea elements and the corresponding elements in the tea water were measured. The sample is digested by closed high pressure microwave digestion to avoid the loss of elements during digestion. The contents of K, Mg, Al, Mn, Zn, Fe and Ca in black tea were determined by inductively coupled plasma optical emission spectrometry. The deionized water was used to simulate the tea brewing process, and the gradient was soaked 5 times, respectively, the tea was taken, and the matrix was matched and determined on the machine. The experimental results show that the method recovers the ratio of the content of K, Mg, Al, Mn, Zn, Fe and Ca in the first soaked tea to 45. 35%. 6. 23%, 2.16%, 1.68%, 7.8%, 2.0% and 0.4%, Ca dissolution rate is the lowest, soaking rate and soaking of K, Mg, Al, Mn in tea soaked The number of times is exponential, and the dissolution equation is y = 105. 75e-0. 874 3x, y = 9. 949 3e-0. 969 5x, y = 6. 335 8e-1. 406 5x and y = 4. 247 7e -1. 339 4x, correlation coefficient R2 is 0. 986,0. 928 3,0. 950 7 and 0. 926.