Arable land is relatively scarce in China, particularly in mountain areas, and the currently rapid process of urbanization is further threatening arable land resource security. The amount of land available is an important aspect of arable land security, and, as this is both quantifiable and adjustable, is of considerable value both for research and operational purposes. This paper takes a mid-low mountainous area, Shiyan City in Hubei Province, as an example, and investigates the state of the regional arable land resources. An empirical approach was used to analyze the structure of the arable land, land use changes, inlfuencing factors, and problems, and then to propose measures to ensure the security of arable land availability. As wel as the present use of the rich cultivated land reserve in the mid-low mountains to complement other cultivated land, sensible land management arrangements are required to meet the demands of urbanization, and use the mid-low mountain areas to meet the changing needs for urban and rural construction land, identify potential rural construction land, and so guarantee the security of cultivated land resources in mid-low mountainous areas.%中国人均耕地资源不足，中低山区耕地资源安全问题更为突出。高速城镇化进程致使耕地数量减少，耕地资源安全受到严重威胁。耕地数量安全作为耕地资源安全的重要构成，具有可量化与可调控等特点，更具研究价值和实际操作性。以中低山区为研究区，对区域耕地资源数量进行调查研究，通过实证方法对耕地结构、变化、影响因素、利用中存在的问题进行分析，提出利用中低山区丰富的耕地后备资源合理补充耕地、有序推进“山地整理”满足城镇化需求、实施中低山区城乡建设用地增减挂钩、挖掘农村建设用地潜力等方法，以保障中低山区耕地资源数量安全。
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