河谷型城市是城市主体在河谷中形成和发育的一类城市。
The valley city is a type of city whose main part has formed and developed in the valley.
河谷型城市由于受到山脉的限制和河流的分割，地域空间狭窄，城市交通问题突出。
Owing to the river-valley type of the city limited by the mountain range and cut by the rivers, the regional space is narrow and the urban traffic problems are serious.
文章最后通过与同类型的河谷型城市的横向对比，揭示出开发区主导下的兰州城市空间结构演进的特征、模式和动力机制。
At last, comparing with other valley-cities, this thesis indicated the model, characteristics and dynamical mechanism of development zone and urban spatial structure evolvement of Lanzhou city.
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