Linhai is the hometown of Seedless citrus in China, a national demonstration base of pollution-free citrus production, and a county of establishing national pollution-free citrus standardization demonstration area. It has established the national "863" project orange informatization demonstration base, the first batch of Citrus standard gardens of the Ministry of agriculture, the promotion and demonstration base of "high quality citrus production technology" of national agricultural talent introduction achievements, the modern citrus production demonstration park of Zhejiang Province, and the excellent citrus garden of Zhejiang Province. Tangerine is the first of the four leading agricultural industries in Linhai City. It has a long history of planting. It was first planted in the Three Kingdoms and was listed as a tribute in Sui and Tang Dynasties.

First Industry's factory is located in Linhai City, Zhejiang Province, and has very rich experience in citrus sorting. Recently, due to the harvest period of mandarins, the factory has a large number of orders for orange sorting machines, tangerine cleaning and grading machines, mandarin  orange cleaning, grading, drying and waxing machines, and tangerine grading and packaging machines.

From late October to mid November every year, it is the best picking period for Linhai tangerine. At this time, the peel of tangerine is golden, and the sweetness reaches the peak. It is sweet and slightly sour, sweet but not greasy. It melts at the entrance, and there is no residue at all. Moreover, the sweetness of Linhai tangerine produced in the core production area can basically reach 14-18 degrees (the sweetness of common tangerines and common fruits is 8-13), which is strong 99% of the fruits in China. The soil for orange planting must be fertile soil with deep soil layer (60cm), soil pH value between 5.5 and 7.0, and the slope of orchard terrain should be lower than 25 degrees, which is conducive to drainage and light. It is precisely because of the local unique microclimate, high fertility soil, abundant irrigation water and special planting methods that create the extraordinary quality of Linhai tangerine.