The complex of Pure Kojic Acid and divalent heavy metal is better than Bordeaux mixture (an insecticidal and bactericidal agent) for several plant fungal diseases. The above-mentioned kojic acid complex is easy to prepare, and can be sprayed on the leaves to adhere firmly without damaging the plants. These metal groups are linked to kojic acid in a non-ionic form, so the toxicity to humans is very low, and it is safer than Bordeaux mixture. Kojic acid is also an activator of nicotinic insecticides. When dealing with melon silkworm (Diaphaniahyalinata L.) and subtropical armyworm (Prodeniaeridaniacram.), spray in 5% nicotine sulfate pyrophyllite powder or 5% nicotine bentonite When 5% kojic acid was added to the drug, its toxicity increased by 35% and 50%, respectively. Pure Kojic Acid can also be used alone as an insecticide. Its mechanism of action is: in the coexistence with the individual pests, it affects the reproduction of the pests, disturbs its hormone system, and then eliminates all the pests. Unlike traditional pesticides, it can not only kill all pests, but also harmless to humans and animals, and does not pollute the environment. Nickell and Gordon (1963) have recommended kojic acid as a plant growth stimulator. From the perspective of patents in recent years, kojic acid is very promising as a crop yield enhancer. The method is to spray the leaves of crops or infiltrate the roots and seeds with kojic acid or its salt, which can promote the rooting of crops and the initial growth of stems and leaves, promote flowering and fruiting, and improve yield and quality. For example: spray sweet potato seedlings with 0.01-1000mg/L kojic acid solution before planting, the harvested sweet potato starch content increases by 10%-20%, and the total yield increases by 20%-30%; from tomato flowering to harvest, on the leaf surface After spraying 100mg/L kojic acid solution 8 times, the ripeness, sugar content and individual body weight of tomatoes all increased significantly. my country is a big producer of hybrid rice. At present, the seeds of hybrid rice need to be treated with “920”. Considering the advantages of Pure Kojic Acid in terms of yield and cost, it may make a difference in increasing the production of major food crops such as rice, corn, and wheat.