政府机构在制定房地产市场宏观调控政策、城市发展规划时,首先要了解城市居民的购房能力,而房价收入比是常被用来评估居民购房能力的经济指标,由于房价收入比定义的特殊性及其假设条件与现实的严重不符,其令人信服的程度总是受到质疑。本文基于城市居民购房的行为,对房价收入比进行改进,提出新的评价居民购房能力的经济指标——还款系数,更加客观合理地评价城市居民的购房能力。 Government agencies in the development of macroeconomic regulation and control policies for the real estate market, urban development planning, we must first understand the purchasing power of urban residents, and price-earnings ratio is often used to assess the purchasing power of residents of the economic indicators, due to the specific definition of price-earnings ratio and Its assumptions are not in line with the serious reality, and its persuasiveness is always questioned. This paper, based on the behavior of urban residents buying houses, improves the ratio of house price to income and puts forward a new economic index - the repayment coefficient, which evaluates the purchasing power of residents - to evaluate the purchasing power of urban residents more objectively and reasonably.