Longan cv.Guilong No.1 is a new variety selected from offspring plants of mutated individual seedlings in Beihai of Guangxi. It was examined and approved by Crop Variety Authorization Committee of Guangxi Zhuang Autonomous Region in June of 2014. In Nanning, the fruits of the variety were harvested on 15th to 20th of July. The average single fruit weight of the variety was 11.7g. The edible portion was 67.91% and the TSS was 18.5%. The pulp of the variety was crisp with little juice.