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It expanded to 106119ha in 1973, descented to 99167ha in 1987, backed up to 112440ha, and attained the max value in history—123170ha in 1998 and descent to 109934ha again in 2001. GIS overlaying analysis shows that, the spatial change of Minqin Oasis had the different characteristics in different stage in the last 50 years: at the end of 50's to the beginning of 70%, oasis expandation Was performed by extension of origin oasis; the atrophia of oasis from the beginning from 70's to the 80's was performed by increasing of non-oasis spot pieces of inner part for oasis; the main performance of keeping on expanding of oasis from late 80's to late 90's is outside extension of Baqu oasis near the upper stream, with increased oasis area in interior of hungriness and increased area of non-cultivation in Huqu oasis in the north. From 1998 to 2001, opening up wideness in interior of hungriness continued, but hnngrinessization of oasis became worse. The oases in the Minqin Basin developed from small to large and back to small in terms of area changes, and from south to north then to south in terms of spatial changes.
绿洲分布图的GIS叠加覆盖分析表明，近50年来民勤绿洲的空间变化在不同阶段有不同的特征：50年代末至70年代初，绿洲扩展主要表现为已有绿洲的外延式扩大；70年代初至80年代后期的绿洲萎缩，主要表现为绿洲内部非绿洲斑块增加；80年代后期至90年代后期的持续扩展，主要表现为靠近上游的坝区绿洲向外围扩展和荒漠腹地绿洲面积的增加，而北部湖区绿洲弃耕面积不断扩大；98年至2001年，绿洲荒漠腹地的开荒还在继续，但湖区的绿洲荒漠化还在进一步加剧。50年来民勤绿洲的发展总体上经历了一个面积由小到大再到小，空间位置上从南而北再向南的迁移过程。
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The result showed that the LUCC of oasis is evident and its spatio-temporal difference is obvious; the index of state and trend in the whole oasis is 0.34, which shows that the transition of type in the oasis presents the characteristics of the bi-directional situation, quasi equilibrium state and regional difference; the indexes of state and trend in the upper and middle part of oasis are 0.63 and 0.56 respectively, which show the non-balance state; the index of state and trend in the lower part of oasis is 0.27, which presents the quasi equilibrium state.
结果表明，三工河流域绿洲LUCC变化显著，时空差异明显；整个绿洲LUCC的趋势和状态指数是0.34，类型转换呈现双向的态势，处于准平衡状态，并出现一定的地域分异，其中绿洲上部和中部分别为0.63和0.56，处于非平衡状态，绿洲下部为0.27，处于准平衡状态。
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Then the sustainable development of Qitai artificial oasis was discussed. Researches showed that the oasis development has gone through three phases: The first was harmonic stage before the middle of 20, the oasis developed according to water resources. The second was unharmonic stage from 1950's to 1980's because of unreasonable policies, that is cultivated area enlarged rapidly and water resources exploited backward. As a result, land output was lower, and environment destroyed heavily. The third stage is after 1980's, the new fragile balance between oasis and its environment was established on the base of the more and more ground water utilization.
研究认为奇台人工绿洲人地关系发展经历了三个阶段：第一阶段是20世纪50年代以前，&以水定地&的相对协调发展时期；第二阶段是20世纪50-80年代人地关系发展失衡时期，人工绿洲迅速扩张，水资源开发滞后，耕地因缺水灌溉而成为低产田，环境破坏严重，人地发展失衡的原因是政策因素；第三阶段是20世纪90年代以来人地关系脆弱平衡时期，决定其平衡的因素是不断增加的地下水开采量。
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oasis farming：绿洲农业
oasis 沙漠绿洲 | oasis farming 绿洲农业 | oasis vegetation 绿洲植被
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oasis farming：绿洲农业;沃洲农业
oasis 绿洲;沃洲 | oasis farming 绿洲农业;沃洲农业 | oblique aerial photograph 倾斜航空照片;倾斜空中照片
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oasis vegetation：绿洲植被
oasis farming 绿洲农业 | oasis vegetation 绿洲植被 | obduction 仰冲