Interest rates can be divided into simple interest and compound interest according to different calculation methods. This article analyzes the interest calculation under different calculation methods in a fixed period. Mathematical function is constructed to get the interest, thus the compound amount under different calculation method and Interest-bearing period can be got. Its application has solved some problems in the actual economic life.%利率按计算方法的不同可分为单利和复利，对固定时间段内，不同计息方式下利息的计算，进行分析，构造数学函数，得到利息，从而求得在不同计息方式和计息期数下本利和的求法以及用其解决了实际经济生活中的一些问题。
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