The series of Seaweed extract are extracted from marine seaweed through Biochemistry method contain cytokinin, oligomeric alginate potassium, betaine, mannitol, polysaccharide, iodine, microelement and alginic polyphenol etc.It has remarkable functions in promoting cell division, anti-stress, anti-plant diseases and insect pests, increasing yield, regulating growth and improving soil condition and so on. Meanwhile, it can comply with requirement of producing green organic food because of its high efficiency and safety.