The rationality of land use structure was assessed with TOPSIS method based on changing data of land use from 1997～2007 in Gansu Province. The results showed as following: ① During 1999～2007 the rationalitie s of land use structure were totally high and were all beyond 80%,the rationali ty of land use structure experienced a fluctuated tendency and that could be obv iously divided into three phases, and the land use structure rationality showed an increase in 1997～1999 first, then it had a steady decline in 2000～2002 and was growing rational in 2003～2007 finally. ② The different change of land use types had different effects on the rationality of land use structure; land use t ypes which had a negative correlation with the land use structure rationality we re garden plot, woodland, residential and industrial land, traffic land and unus ed land, of them unused land had the most negative correlation with the land use structure rationality; on the other hand, land use types which had a positive c orrelation with the land use structure rationality included cultivated land, gra ssland and water, of them grassland had the most positive correlation with the l and use structure rationality. ③ It could be decisive to develop unused land an d conserve grassland in promoting the rationality of land use structure in Gansu Province.%利用甘肃省1997～2007年土地利用变化调查数据,采用改进的TOPSIS方法对甘肃省土地利用结构的合理性进行了综合评价.结果表明: ① 199 7～2007年期间甘肃省土地利用结构合理度总体上较高,均在80%以上,在时间上的变化呈波动趋势,并且可以明显地分为3个变化阶段:即1997～1999年期间土地利用结构不断趋于合理,而2000～2002年期间土地利用结构的合理性变差,2003～2007年期间土地利用结构的合理性有好转的趋势.②不同土地利用类型的变化对土地利用结构的合理性影响不同:与土地利用结构合理度呈负相关的土地利用类型为园地、林地、居民点及工矿用地、交通用地、未利用土地,其中未利用土地的变化与土地利用结构合理度的负相关性最显著;与土地利用结构合理度呈正相关的土地利用类型包括耕地、牧草地、水域,其中牧草地的变化与土地利用结构合理度的正相关性最显著.③开发未利用土地、保护牧草地对调整和优化甘肃省土地利用结构具有决定性的作用.
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