| 因素 | 水平 | ||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| x1 (提取次数/次) | 1 | 1 | 2 | 2 | 3 | 3 | 3 |
| x2 (提取时间/min) | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
| x3 (液料比) | 8 | 9 | 10 | 11 | 12 | 13 | 14 |