Since real estate is an important industry in national economy, there exists close relationship between them. In some developed country, real estate has always been titled Ñweatherglassì. It influences the national economyís continued development, conversely, national economy influences real estate in many sides, such as development level, speed, scale and cycle fluctuationís amplitude, frequency etc. This paper make quantitative and qualitative analysis about the relationship between national economy and real estateís investment scale in China.