Abstract：The machinery is the important material foundation to implement different engineering projects for the architectural construction enterprises. Therefore， to optimize the purchase works of machinery has important meanings. Several factors which influence the purchase of machinery are analyzed in this paper，and it is considered that the construction output value is the most important factor. The construction output value are analyzed furthermore by using the linear regression method-An analyzing model has been established，and the purchase of machinery of the China Railway Engineering General Corporation in year 2000 has been forecasted also in this paper.
2000, Vol. 17 
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