| Code | Factors name | Secondary index |
| Arable land area per capita (I1) | ||
| Ratio of grain sown area to crop sown area (I5) | ||
| Degree of agricultural mechanization (I6) | ||
| Factor1 | Safeguard factor | Per unit area yield of grain (I7) |
| City Engel’s Coefficient (I11) | ||
| Countryside Engel’s Coefficient (I12) | ||
| Grain gap per capita (I2) | ||
| Factor2 | Stability factor | Agricultural labor force (I3) |
| Grain trade dependency (I9) | ||
| Factor2 | Fluctuation factor | Fluctuation rate of grain yield (I4) |
| Grain trade dependency (I8) |