Abstract: Taking the east area of Sulige gas field in Ordos basin as an example, the Arps decline curves were used to calculate the production decline and explain the processes of exponential, hyperbolic and harmonic decline curves in detail in this area. The studies suggest that the east area of Sulige gas field is characterized by low yield, low permeability, low abundance, rapid decline of pressure drop in gas wells, short or no for stable production period, so its decline belongs to hyperbolic decline; the decline rate is greatly influenced and controlled by initial production allocation; the production wells in 2008 in this area entered into decline period in two years later in average, with month decline rate of 1.7%~2.4%. the proration of ClassⅠ, Ⅱ, Ⅲ wells in this area of Sulige gas field are all in the reasonable ranges, indicating this analytical method is accurate and reliable. According to the formula for depletion decline, the net production time is predicted as 15~30 years for the producing wells in this area