In 1930s and 1940s, due to human factors and the influence of Japan's invasion of China, the ancient trees with drooping green trees were not carefully cared for. By 1946, the original three branches withered and the tree was declining. The result of 1948 is only 140. After liberation, the ancient trees were rejuvenated, and 1955 got a bumper harvest with 37 kilograms of fruit. Some of them were sent to Beijing for national leaders, while others were sold to the public in Guangzhou South Building and Zengcheng Theatre, which became a story for a while. Subsequently, due to various factors, the old trees became weaker year by year, and the fruits were not harvested. By 1979, the last branch of the tree had withered, and the withered remains could still be seen. Fortunately, before withering, scientists and technicians took measures to make the tree head sprout before being preserved. In the 1980s, due to the prosperity of the country and the careful management and cultivation of scientific and technological personnel, the newly-grown trees regained their vitality and their crowns continued to expand. By the early 1990 s, it had achieved results, and in recent years it has achieved fruitful results. Now the ancient trees have reached more than 4 meters high, and the crown extends nearly 20 square meters from east to west and from north to south. The old tree is full of vitality and prosperity year by year, just like the National Games. Zengcheng Gualv is based on Xiyuan Gualv mother tree, and now it has developed into a series of varieties, distributed in all towns of the city. There are 20 ~ 30 strains with good quality and stable output. The annual harvest 1.500 kg, which can be supplied to the market 1.250 kg after removing secondary fruits. Because there are many people who advocate fruit, the source of fruit is limited, and the situation of short supply is still very prominent. In recent years, the municipal agriculture and forestry department is guiding farmers all over the country to vigorously develop high-quality litchi planting, and hanging green is the key variety.