Abstract: The more the market economy developed, the more uncertain factors there are in the economy. For this reason, it becomes increasingly difficult to predict and forecast the economy, which triggers the variability of land use. In order to adapt to the changes of land use, the land use planning must be flexible. For the first time, this paper specifically defined the flexible planning of land use, and studied the flexible forecasting, flexible assessment, flexible decision-making and flexible zoning in land use planning through the calculation of flexibility rate and the ascertainment of flexible span; the design of appraisal aim and appraisal system; and the model of flexible decision, etc. The result is that flexible planning of land use can adapt to the changes in the quantity, structure and pattern of land use which are triggered by the uncertain factors in the economy.