| Studying the distribution of characteristic crops can provide a scientific basis for regional agricultural development and it has a great significance to promote rural revitalization and regional high\|quality development. In this study, taking Northern Shaanxi as the research area and millet, potato and apple as the research object, eight main soil and water photothermal condition factors were selected. The soil and water photothermal condition suitability evaluation system of characteristic crops was constructed based on the analytic hierarchy process. The comprehensive suitability evaluation model of crops was constructed, the suitability and spatial distribution of 500 m×500 m units were calculated, and the spatial distribution of characteristic crops was studied by natural breakpoint method. The results showed that the suitability of the three crops was more than 0.78, and the average value was millet > apple > potato. The suitability of millet decreased from southeast to northwest, and the most suitable area was in the southeast along the Yellow River. The suitability of potato decreased from southwest to northeast, and the most suitable area was mainly distributed in mountainous areas. The apple increased from north to south, and the most suitable area was mainly in the southeast. Potato and apple should be planted in the western Baiyu mountain area and Huanglong mountain area in the southeast, and millet and apple should be planted in the eastern area along the Yellow River. In the fine layout, millet was mainly located in most counties in the east and Beiluo River basin in the south while potatoes were mainly located around rivers in the west and north and apples were mainly distributed in the mountains in the south and some counties in the middle and north. |