1. Policy regulation at the national level: in order to stabilize house prices, the state has issued a series of policies, including the unified registration of real estate, the implementation of real estate tax, etc. These policies may have an impact on people investing in real estate, resulting in a reduction of their investment in real estate, which will make the house prices fall.

2. Chifeng local economic development: Chifeng, as a third or fourth tier city, the price of housing has reached 6500 yuan per square meter, and even in the new city has appeared 10000 yuan per square meter of real estate, which has exceeded the local average salary and income level of the people. Due to the limited purchasing power of local residents, they may not be able to afford the high prices, resulting in a decline in housing prices.

3. Investors' expectations of the real estate market: there are more and more people with a wait-and-see attitude towards real estate investment. This may be due to the fact that in some places, such as Chifeng, the house prices are already too high and investors are worried that the house prices may fall in the future, so they may choose not to invest for the time being or sell some of their properties, which will also lead to the fall of house prices.

4. Impact of land price and development cost: Land price is an important factor affecting house price. While land prices may rise with urbanization, developers may buy less land when land prices rise to a certain level, which can lead to a fall in house prices. In addition, development costs such as labor costs can also affect house prices.

5. Impact of supply and demand in the market: The supply and demand in the real estate market also has a great impact on house prices. When the market is oversupplied, house prices may fall. In addition, if the government increases the supply of land or increases the supply of subsidized housing, it will also have an impact on house prices.

6. Impact of the global economic situation and domestic economic environment: The global economic situation and domestic economic environment can also have an impact on house prices. For example, factors such as slowing global economic growth and downward pressure on the domestic economy may make investors' expectations of the real estate market change, thus affecting home prices.

Overall, the reasons for the decline of house prices in Chifeng may be manifold, including policy regulation, economic development, investor expectations, land prices and development costs, market supply and demand, as well as factors such as the global economic situation and the domestic economic environment.