There may be many reasons for the decline in housing prices in Wen'an County:

1. Economic factors: The economic cycle is in the recession phase, causing housing prices to fall. In addition, Wen'an County's industrial development may face problems, affecting the region's economic growth, which may also lead to a decline in housing prices.

2. Policy influence: Policy regulation of the real estate market may also be the reason for the decline in housing prices. When policies are tightened, it becomes more difficult for banks to obtain loans and the purchasing power of home buyers is restricted, causing housing prices to fall.

3. Regional planning: Wen'an County may be undergoing or planning to undergo urban renovation and industrial upgrading, which may lead to a decline in housing prices in some areas, especially those areas that require demolition.

4. Population flow: Population flow in Wen'an County may affect housing prices. If the population shrinks and demand falls, house prices may fall. At the same time, if population inflow decreases, real estate developers may reduce investment, which will also cause housing prices to fall.

5. Market supply and demand: If there is an excess supply of housing in Wen'an County and insufficient demand, this may lead to a decline in housing prices.

6. Insufficient purchasing power: If people’s income does not keep up with the rise in housing prices, insufficient purchasing power may also lead to a decline in housing prices.

7. Environmental pollution: Environmental pollution problems in Wen'an County may affect housing prices. If pollution problems become severe, people may be more inclined to leave the area, which could lead to lower house prices.

In general, the reasons for the decline in housing prices in Wen'an County are complex and may be the result of a combination of factors.