笛子最常用的就是CDEFG五个：
C：68cm，声音最低沉，笛子最粗最长，孔距离得最远。
G：48cm，声音最高，管子最短最细
F：52cm，对于一般学者来说，F大小最合适，也最好发音，适合的歌曲比较多！
手稍微大点的男生来说E是最佳的选择，而且E曲子最多，对于手小的孩子来说，G是最合适的选择，因为G最小。
身高140cm以下的或者手很小的建议G，成年女生和手较小的男生考虑F，男生或者手比较大的考虑E。
C和D练习气息比较好，对学习进步比较大。要根据自己的情况来选择：

The flute is the most commonly used CDEFG five:

C: 68 cm， lowest voice， flute the thickest and longest hole furthest distance.

G: 48 cm， voice is highest， the shortest fine pipe.

F: 52 cm， for the general scholars， F the most appropriate size， also had better pronunciation， more suitable songs!

Hand slightly bigger boy E is the best choice， and E tune up， with hand small children， G is the most appropriate choice， because G is minimal.

Height 140 cm or hand under small suggestion G， adult women and hand the smaller boys consider F， boy or bigger considering E hand.

C and D practice breath better， progress in learning. According to their own situation to choose:

G调：48cm
F调：52cm
E调：56cm
D调：62cm
C调：68cm