The government purchase law of our country determines the government purchase contract as complete civil contract . it is an improper choice made under the circumstances that the thinking mode of the public law can not be in harmony with private law and only one of them can be chosen , being indifferent to the important change of mode of the government ' s administrative act , and no space leaven for the governmental purchase contract in the present administrative litigation and procedures 我国的政府采购法将政府采购合同定性为完全的民事合同，完全适用合同法，是在传统的行政行为理论指导下，是在公法与私法不可相融、二者必居其一的思维定势中，是在对政府行政活动方式已发生重大变化的漠视中，是在现有的行政诉讼模式与行政程序法中没有为政府采购合同留下空间的情况下所作的不当选择。
I have taken impotance to analyze the rallying point of famous product , concrete cost and capability of providing and guarantee in this artical , meanwhile , i have caculated the quantity of concrete needed for the year and got the regression equation with the historic data for drilling footage of eight years and the consuming quantity of oilwell cement by the method of linear regression , and it has very significance for the making of stock contract and the plan of concrete production , i have analyzed the physical distribution of oilwell cement by the transpotation flex and the advantage or disadvantage between direct distribution and distribution to store in this artical , and i have tried to find the balance point of the two distribution ways by the ecnomic analysis and pointd out the conception of economic semidiameter , and come to the conclusion of direct distribution , distribution to store , and subarea of distribution to store at last 本文对油井水泥供应商在品牌号召力、水泥成本、供应保障能力等方面进行了详尽分析,并对供应商进行了能力排序;用线性回归方法从八年钻井进尺与油井水泥消耗量的历史数据推算了当年度油井水泥需求量,得出了回归方程,这对于油井水泥采购合同的制订、水泥供应商生产计划的制订具有相当重要的意义;从运输弹性分析出发对油井水泥物流配送进行了研究,对直达配送、入库配送的优缺点进行了详细的分析,在经济分析的基础上力求找到两种配送方式的均衡点,并提出了经济半径的概念,得出了直达配送、入库配送、入库分区距离等几项结论。
The purchase contract management is ensured to fulfill the contract , analysed the risk of purchase contract management , indicated that the appraisal of purchase contract management is the monitoring appraised of the contract management process , introduced appraisal target of purchase contract management based on earn value , as well as the process of appraisal 摘要采购合同管理是履行合同的保障，通过对采购合同管理风险的分析，指出采购合同管理评估是合同管理过程监督评估，介绍了基于“挣值”的采购合同管理绩效评估指标，以及进行评估的过程。
This article analyses thoroughly that the government ' s purchase act has the nature of judicature and public law , proves comprehensively the advantage and malpractice of applying completely the contract law to the governmental purchase contract . it approaches the relation of public law and private law , administrative law and civil law , tradition al administrative act and civil act , administrative contract and civil contract , and administrative litigation and civil litigation from respects of history and reality , it regards them as something come from same origin and can be linked with each other 本文深入地分析了政府采购行为的私法属性及兼有的公法属性，全面地论证了政府采购合同完全适用合同法的优点及弊端，从历史与现实出发，探讨了公法与私法、行政法与民法、传统的行政行为与民事行为、行政合同与民事合同、行政诉讼与民事诉讼的关系，认为它们是同源的，是可以相通的。
