The domestic and state-recognized floral license is only at the level of flower arrangers, which is relatively easy to test, with relatively simple skills and no authority. At present, the best certificates in the world are AIFD from the North American Flower Merchants Association and DFA from the Netherlands. However, the examination of AIFD is very strict, and it takes a long time to take the all-English exam, but the qualification is the most powerful in the world at present. Every qualified flower shop has a world number, and there are only a few hundred at present.