(1) Divide the fruit development period according to the fruit development period, that is, the days from flower falling to fruit ripening. Therefore, it can be divided into early-maturing varieties (< 90 days, mature before mid-July in central and southern Hebei), middle-early-maturing varieties (90 ~ 120 days, mature from mid-July to early August in central and southern Hebei) and middle-maturing varieties (120 ~ 150 days, mature from mid-August to early September in central and southern Hebei). Mid-September to1early October), late-maturing variety (> 180 days, mid-September 654381early October). (2) According to the color of ripe fruits, they can be divided into yellow varieties, green varieties and red varieties. Yellow varieties such as Wang Lin, Jin Guan, Jin Biao, Jin halo, etc. Green varieties such as Australian green apple, India, etc. Red varieties, such as Fuji and Marshal. , and divided into flake red (also known as type I, such as Huimin Short Branch, Yanfu No.2, Hongwangjiang, etc. ) and striped red (also known as type II, such as Fukushima and Yanfu No.3). ) according to the coloring type. (3) According to the fruit size and average fruit weight, apples were divided into 9 categories. That is, extremely small (below 25g), extremely small (25. 1 ~ 50g), small (50. 1 ~ 80g), small (80.1~10g), and medium (. Large (150.1~180g), large (180.1~ 200g), super large (200.1~ 250g) and extra large. (4) According to the chromosome number of varieties, they can be divided into diploid, triploid and tetraploid varieties. Most apple varieties are diploid, and triploid varieties include Jonakin, Beidou and Lu Ao, and varieties with more than four chromosomes are extremely rare. (5) According to the origin, it can be divided into Fuji, Marshal, Jonah, Gala and Golden Crown. (6) According to the morphological characteristics of plants, they can be divided into common varieties and short-branched varieties. The main short branch varieties used in production are Marshal's AS, E 'ai No.2, Aixian, New Red Star, Shouhong, Hong Chao and Hong Yan, Jinguan's Jin Aisheng, Huang Aisheng, Stark's Jin Aisheng, Bailong's Yanqing, Fuji's Fukushima, Miyazaki, Liquan and Yanfu No.6.