At present, the breeding area of kelp in China is about 15000 hectares, and annual yield of dry product is 270 000 tonnes accounting for 50% of the total yield of seaweed in the world. TA emulsive powder can remarkably increase the yield and improve the quality of kelp. After the kelp seedling soaked in 2 mg/L TA solution for 2 hours and then put into breeding, the growth of rhizoid can be promoted and the seedling preservation rate can be raised, the content of chlorophyll and fucoxanthin increased, photosynthesis rate raised, accumulation of dry substance increased, activity of PEP carboxylase raised, metabolism of carbon promoted, activity of nitric-reductase raised, metabolism of nitrogen promoted, absorption of nitrogen, phosporous, potassium increased, growth and development promoted, contents of nucleic acid and protein raised, physiological adjusmtent strengthened, anti-disease property strengthened, rate of incidence of disease reduced. The yield of dry substance increased by 6.5 t per hectar in average compated with the treatment on the blank, that is increased by 35% . At the sametime, 24.24 kg iodine, 1.665t brown alg gum, and 1.278 t mannitol in kelp are increased per hectar. TA emulsive powder is a pioneer product at home and abroad. It has the advantages of non-toxic, high efficiency, low cost, no deterioration and convenience in storage and transport, etc. It has been popularized in 15 000 hectares in the whole country and the economic benefit is more than 300 million yuan.