Abstract: In order to understand the influence of water supply factor, feed factor, erosion factor and heat factor on the suitability of pepper planting in Jialing River basin of Baoji section of Fengxian county, this study established the suitability evaluation system of prickly ash planting in Jialing River basin of Baoji section, studied the raster image of spatial distribution grade of each influence factor in the basin, and divided the suitability of prickly ash planting in the basin. The results showed that, the dry land distribution in Jialing River basin of Baoji section is relatively scattered, and the areas suitable for planting prickly ash are few, and they are all near the water source. Therefore, most dry land was not suitable for growing prickly ash. Among them, 1.508 square kilometers of dry land was not suitable for planting prickly ash, accounting for 21.4%. Generally, it covered 1.975 square kilometers, accounting for 37.9% of the total dry land area. The suitable area was only 2.684 square kilometers, accounting for 27.9%. Very suitable dry land area was also very small, 0.909 square kilometers, accounting for about 12.8%. So there are very few areas suitable for planting prickly ash in the Jialing River, to some extent, people are reminded that proper fertilizer should be applied when planting prickly ash. In the tillage process, soil supervision should be strengthened to avoid pollutants from entering the soil, so as to improve the utilization rate of dry land.

Key words: Baoji section, Jialing River basin, prickly ash, suitability