| As the mother river of the Chinese nation since tens of thousand years the Yellow River has brought up the Chinese nation and witnessed the rise and fall and the growth of the Chinese nation. The source of the modern Yellow River has already had the solid conclusion, however, the JiuQu Yellow River which flows through the north of china has changed at intervals. Studying from the angle of the ancient Yellow River, we can see that its source of water-system is an important topic deserving further research and knowing from a new angle. The origin of the history water level of Qinghai Lake. The problem of the drop of Qinghai Lake's water level has been put forward in the reports of many research organization and some scholars'articles. It has been introduced in some representative essays such as "The Chinese supply of water in 21st century", "The lagoon integrated survey report of Qinghai Lake", "The environment of Chinese Lake"and so on. According to above all, some scholars consider that, the Qinghai Lake in the Recent Epoch, the water level has already descended more than 100 meters, and its area was bigger than now by 1\3. In the synthetically study processes of the changes of the Chinese northern environment and the ancient Yellow River's source of water system, my tutor has put forward the further problem of the descent range of Qinghai Lake's water level in the base of the arguments talked above. His general idea is that since the Pleistocene Epoch of night the range of Qinghai Lake's water level has dropped much more than 100 meters. The understanding of the Alashan Plateau's remote sensing image. It can been seen from the whole Alashan plateau's remote sensing image that the characteristic of the landforms of the Alashan Plateau announces the distributed characteristic of the ancient source of water-system in the Alashan Plateau. First, the BaDanjilin desert, the Tenggeli desert and the WuLanbuhe desert are connected together physically. But they are separated by the intermittent mountains ----YaBulan Mountain, HaWula Mountain, the Wolf Mountain and HeLan Mountain. Second, the desert form has the obvious distributed characteristic of lake and river both ends of the sandy cages which are connected with the lake. In the desert distributing some lagoons and sands which can be known as alternating or communicating with each other. Third, the modern flowing sandy river crossing from northwest to southeast passes through the mountain systems, extending to the east part of Yellow River and the Great Bend of the Yellow River. Fourth, the fact that the flowing sandy river which crosses from northwest to southeast, the southeast part of the Tenggeli desert and the modern Yellow River have merged into an entirety reveals their communication and identity. The Problem of the source of the ancient Yellow River's water system and the foundation of the choosing subject. On the basis of above comprehensive analysis of the preceding research data and my tutor's long-term research foundation, and after the researches of remote sensing pictures, it is put forward in this article the question of the Qinghai Lake's historical water level and the Yellow River's water system and its relationship. Therefore, this article takes them as its topic. The specific basises are as follows: 1. It is the consensus of the academic circles that the Qinghai Lake's water level has dropped. There are many different treatises about the range. But through the analysis and explain of the remote sensing pictures, we find that the historical highest water level of the Qinghai Lake is not only higher than now by 3196 meters but also has the possibility to achieve the data 200 meters, higher than the controlling statistic. 2. The exit of the Qinghai Lake's east-northern part and the HuangShui Valley are connected together, the exit of the southeastern part and the Republican Basin, GuiDe Basin are connected together. If the historical highest water level of the Qinghai Lake has actually achieved the data, higher than now by 200 meters, the northern part will overflow to connect with the HuangShui water system, and the southeastern part will overflow to connect with the modern Yellow River directly. 3. The analysis of the Alashan Plateau remote sensing pictures shows us that an ancient water system should have existed on the Alashan Plateau whose river nets and lake groups are huge and various. 4. The ancient water system of the Alashan Plateau and the modern Yellow River are connected east and southeast. They are one part of the source of water system. An important question about the source of water-system of the ancient Yellow River is made up of the relationship of Qinghai Lake's historical waterlevel and the Yellow River's water system, and the relationship of ancient water-system of Alashan Plateau and modern Yellow River. The basic thoughts and the research meanings of this text. The basic thoughts lie in the macroscopic remote sensing images and the fidelity of three-dimensional landscapes, to show the audio-visual geological terrain landform. In this way, people can hold the overall situation from the macro view and make the important regions outstanding so as to improve the translating ability of remote sensing images. It study the information and evolution processes of the Yellow River from one side, find out the regulation of the formation and evolution of the Yellow River and probe into the source of water system of the ancient Yellow River. The research of this topic gives a useful hand to know the regulation of the formation and evolution of the Yellow River, and it has the important reference value on the improvement of the northwestern ecosystem environment and the developing strategy of the northwest. The main technological/method and the care research contents The first research about the three-dimensional remote sensing technique offers valid evidence for the announcement of the ancient Yellow River's source of water system. The main contents of this article are as follows: 1. The research of large regional 3D image manufacture. The whole research process takes the three-dimensional remote sensing technique as its main line. By the method of making traditional three-dimensional pictures, a set of practical methods to develop the large-regional 3D remote sensing images can be put forward to solve the problems. 2. The research and realization of the source-happening flood evolutional imitating technique. On the basis of the discussion of the types of flood inundated, we put forward the concept of source-happening flood, and the dynamic source-happening flood evolution imitating system can be developed. This system can vividly imitate the water level'rising process inside the lake basin in the rising process of the lake's water level and the overflowing process of the exit of the lake basin and also the direction of the flowing water the river course after the water overflows from the exit of the lake basin. 3. The research of the Qinghai Lake's historical height of water level. The research domain of the drop of the Qinghai Lake's water level is the current arousing general interests. Using year as the dimension to study the regulations and the development trends of the change of the water level, the research stance of this text is fixed to the whole history of the formation andthe development of the Qinghai Lake. In the angle of the river and lake accumulated together in the Quaternary Period and the lake turning to the landform. We can announce its historical height of water level and the revivification of the origin feature. 4. The study of relationship between the Qinghai Lake and the Yellow River's water system. One of the key techniques adopted in this text is using the real terrain data, adopting the flood evolutionary dynamic imitating technique to reappear the waters state under the ancient water level's situation and uncover the inside relationship between the Qinghai Lake's water system and the Yellow River. Adopting this technique realizes the vivid imitation of the spread area after the Lake rises and sees the ancient landscape that the lake flows along the river course to the Yellow River from the macroscopic point of view. 5. The uncovery distributed characteristic of Alashan Plateau ancient water-system. On the basis of three-dimensional Remote Sensing images, we research the situation and the distributed law of BaDan TiLin Desert, YaBulai Mountain, HaWuLa Mountain, Wolf Mountain, TengGeLi Desert, WuLanBuHe Desert, HeLan Mountain, Yellow River and HeTao Plain's river-lake sediment, from west to east, and what's more interpret the floating law of plateau sand-river and the distributed characteristic of ancient water-sysytem. 6. Applying the three-dimensional image technique to study the fossil water system of the Alashan plateau. On the foundation of DEM and the remote sensing images we develop the whole terrain landform 3D images of the region and have an audio-visual complete understanding of the natural geography situation and the terrain. Seeing it, we can completely observe and study the BaDanjilin desert, the YaBulai Mountain-HaWula Mountain-wolf Mountain mountain range, the Yellow River, the HeTao plateau about their river-lake accumulation situation and their distribution law, and also explain the flowing law of the plateau sand river, the law of the ancient water system's flowing direction and reveal the inside relationship between the ancient water system of the Allah plateau and the Yellow River. There is a huge net of ancient water system in Allah plateau. It runs from BaDan JiLin basin to the east and then gather at the HeTao area and continue running the southeast from the southern at last, they assemble in the Tenggeli basin. The ancient water system of Allah plateau, in other words the ancient Yellow River is connected with modern one. It is one of the source systems of the Yellow River. There are at least three main paths connected with modern...
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