he change of interest rate will affect many factors. Bond is a kind of financial contract, and there is a relationship between bond and interest rate. Moreover, there is a certain relationship between gold supply and demand, asset pricing model and arbitrage pricing and interest rate. This time, we will conduct a detailed study and give some examples to answer the three questions: the factors that lead to the rise and fall of interest rate, the factors that affect gold supply and demand, and the differences between asset pricing model and arbitrage pricing.