Research on effect of inorganic fertilizer combined with various rates of NTT bio-organic fertilizer applied in Phuc Van Tien tea variety, the results in not only better growing, larger canopy, higher bud growing, but also better productive constituents and productivity than other fertilized formulas with the ratio of 60kg of N + 33kg of K2O + 33kg of P2O5 accompanied with 20 tons of NTT per hectare. When using the above ratio combined with 15 tons of NTT per hectare, it is significantly reducing the level of damage from pests like thysanoptera, homoptera, and diptera.