| | No. | Producing areas |
| | S1 | Wuzhong, Ningxia, China | | S2 | Wuzhong, Ningxia, China | | S3 | Wuzhong, Ningxia, China | | S4 | Wuzhong, Ningxia, China | | S5 | Guyuan, Ningxia, China | | S6 | Guyuan, Ningxia, China | | S7 | Lanzhou, Gansu, China | | S8 | Lanzhou, Gansu, China | | S9 | Wuwei, Gansu, China | | S10 | Dingxi, Gansu, China | | S11 | Dingxi, Gansu, China | | S12 | Qingyang, Gansu, China | | S13 | Baiyin, Gansu, China | | S14 | Chifeng, Inner Mongolia, China | | S15 | Chifeng, Inner Mongolia, China | | S16 | Ordos, Inner Mongolia, China | | S17 | Lvliang, Shanxi, China | | S18 | Alaer, Xinjiang, China | | S19 | Ili Kazak Autonomous Prefecture, Xinjiang, China | | S20 | Ili Kazak Autonomous Prefecture, Xinjiang, China | | S21 | Harbin, Heilongjiang, China |
|
|