"Constant price GDP (Real Gross Domestic Product, referred to as Real GDP) refers to the GDP calculated with a certain base period price. Compared with the nominal GDP (Nominal Gross Domestic Product), the constant price Gross domestic product takes into account the effects of prices and thus more accurately reflects a country's economic output.

The calculation process of GDP at constant prices usually includes the following steps: First, determine a base period, usually the average price level of a year or a quarter. Then, compare the price index of each year or quarter with the price index of the base period to obtain the price index. Finally, nominal GDP is divided by the price index to obtain GDP at constant prices.

GDP at constant prices plays an important role in economic analysis. By comparing GDP at constant prices across different years or regions, we can more accurately assess the extent of phenomena such as economic growth, inflation, and recession. In addition, constant price GDP can also be used as the basis for national or regional economic policy formulation, helping the government understand economic conditions and trends, and take corresponding control measures.

In short, constant price GDP is a kind of GDP calculated with base period prices, which can more accurately reflect the actual situation of economic output. It plays an important role in economic analysis and policy formulation, and is one of the important indicators to measure the economic status of a country or region. "