Based on statistical analysis and theoretical research on the declining production data of oilfield oil wells，Arps proposed three classical decline models of exponential，hyperbolic and harmonic，which have been highly valued by the world and have been widely used in the evaluation of global oil and gas industry production and recoverable reserves. It should be noted that the Arps exponential decline is a decline model in which the decline rate is constant and the production is declining faster. Because the predicted indicators are relatively stable，it is widely adopted by evaluation companies.The hyperbolic and harmonic declines of Arps are two models with slower decrement，which are not widely used in practice.The linear decline model established by Chen Yuanqian et al.in 2015 is only applicable to the linear decline of production over time，and the decline rate increases with time. The power function decline model is established in this paper，and its decline rate decreases with time. According to the decline exponent n proposed by Arps：linear decline model n=-1，exponential decline model n=0，hyperbolic decline model 0