1. The population mobility is low. Residents in small counties are less mobile, less open to society and relatively closed in population. This limits the scope of people's communication and the choice of objects, which is not conducive to marriage and love.

2. The pace of life is slow. The pace of life in small counties is slow, and many people are content with the status quo and lack the motivation to change and develop. This also makes some women's development limited to the education stage, and there is no greater pursuit of career and love.

3. The concept of marriage and love is conservative. The concept of marriage and love in small counties is more traditional and conservative, and the idea of son preference is still relatively common. Many parents also pay more attention to family background and family background, ignoring their daughter's personal development, which is not conducive to women's entrepreneurship and choosing the right marriage partner.

4. Lack of resources. Small counties lack public resources such as medical care and education, which is not conducive to the development of women. Therefore, many women don't have too high requirements and prefer to stay at home, which also reduces their competitiveness in the marriage and love market.

5. There are few opportunities. There are relatively few job and life opportunities in small counties, especially those suitable for women, which also makes many women lose their growth motivation and enterprising spirit. In this environment, once the best marriage period is missed, it is easier to become a "leftover woman".

To sum up, the reasons for the increase of leftover women in small counties are low population mobility, slow pace of life, conservative concept of marriage and love, lack of public resources and few opportunities. These factors limit the development of women and make them more vulnerable to disadvantages in the marriage and love market. Once they miss the best marriage period, it is difficult for them to find an ideal partner and it is easy for them to become "leftover women". To change this situation, we must change from the environment, ideas and opportunities.