More than 2,000 years ago, Guo Yigong of Jin Dynasty had made such an evaluation on the walnuts in Chengxian and surrounding areas in "Guangzhi": "Chencang walnuts have thin skin and multiple muscles, and Yinping walnuts are large and brittle and rushed." Geographical conditions are suitable for the growth of walnuts. Therefore, compared with other places, Chengxian walnut trees are strong, fruit-shaped gardens, thin skin, full of meat, pure meat, high oil yield, and are well received by domestic and foreign merchants and consumers. Favored. The 40-year-old tree can reach 13 meters in height, 1.5 meters in dry circumference and more than 10 meters in diameter. The fruit has a large suture line, smooth fruit shell, light yellow or light amber color, rich and full, no odor, sweet and delicious. Rich in nutrition and high quality.

Chengxian walnut won the “Top Ten Famous Fruits of Gansu”, the Silver Award of China International Forestry Products Expo, the Silver Award of China International Forestry Products Expo and the Bronze Award of Gansu Second Forest Products Fair, with its unique sense and quality. Yangling Agricultural High-level Association "after the award" and many other honors.

Chengxian walnut quality technical requirements 1, varieties of thin shell varieties. Second, the site conditions of the production area within the altitude of ≤ 2000m, soil type is cinnamon soil, valley tidal soil and mountain brown loam soil, soil organic matter content ≥ 1%, pH 7.0 to 7.5. Third, cultivation techniques Seedling: Grafting seedlings. 2. (2) Planting density: ≤330 plants/ha. 3. Fertilization: The main organic fertilizer is decomposed, and the amount of fertilizer applied is ≥50Kg per plant. 4. Environmental and safety requirements: The use of pesticides, fertilizers, etc. must comply with relevant national regulations and must not pollute the environment. Fourth, the color of the green peel in the upper and middle of September is changed from green to yellow, and 10% to 30% of the whole plant's green peel is harvested when cracking occurs. V. Quality characteristics 1. Sensory features: nuts oval, round. The nucleolus is full and the shell is thin and easy to take. 2. 3. Safety and other quality technical requirements: Product safety and other quality technical requirements are in line with relevant national regulations.

Apply to：
Producers within the scope of Chengxian walnut production area may apply to the Chengxian County Quality and Technical Supervision Bureau of Gansu Province for the use of the “Special Mark for Geographical Indication Products”, which shall be reviewed by the Gansu Provincial Bureau of Quality and Technical Supervision and reported to the General Administration of Quality Supervision, Inspection and Quarantine for approval. The testing agency of Chengxian walnut is selected by the Gansu Provincial Bureau of Quality and Technical Supervision in the testing institutions that meet the qualification requirements.