Abstract: On the base of applying the same doses of nitrogen and phosphor fertilizer, effects of adding some different kinds of fertilizers containing potassium element on tea’s growth in red-yellow soil tea garden were studied in this paper. Results showed that: treatment of adding fertilizer of potassium and magnesium sulfate reached the best result to improve tea’s growth. Compared with the result of applying nitrogen and phosphor fertilizer singly, it could enhance spring branch’s length and leaf’s number by 6.23% and 11.1%, respectively; increase leaf’s area, bud’s density, weight per hundred buds and tea’s yield by 11.17%, 28.88%, 21.43% and 14.27%, respectively. Treatments of adding potassium sulfate or chlorinated potassium could improve tea’s growth obviously, too. The front treatment could enhance leaf’s number, leaf’s area, bud’s density and tea’s yield better. But, the latter treatment could increase the spring branch’s length and weight per hundred buds better. Effect of adding 45% composite fertilizer on tea’s growth was better slightly than that of applying nitrogen and phosphor fertilizer singly. Compared with the treatment of adding 45% composite fertilizer (it is farmer’s usual method of applying fertilizer), treatment of applying fertilizer of potassium and magnesium sulfate could gain more benefit by RMB 3226.5yuan / hm2, so it should be more popularly applied in red-yellow soil tea garden in future.