摘要：文章针对现行招投标体制下如何有效控制工程造价进行分析，并且提出了一些具体措施。

Abstract: this paper discusses the current bidding system, how to effectively control engineering cost analysis, and puts forward some concrete measures.

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利用群签名体制给出一个可撤消投标者的安全的网上招投标方案。

This paper utilizes a group signature scheme to propose a secure scheme of bidding and tendering on Internet with revocation of bidder.

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但由于当时水利工程管理体制的落后及建筑市场的不规范，在进度控制、运行管理、招投标等方面存在一些问题。

However, owing to the outdated project management system and nonstandard architectural market, there exist some problems such as schedule control, operation management and bidding, etc.

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针对当前电子招投标活动的安全性需求，提出一种基于身份密码体制(IBC)的电子招投标方案。

For the security need of the current electronic bidding, an Identity-based Cryptosystem (IBC) electronic bidding scheme is proposed.

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针对当前电子招投标活动的安全性需求，提出一种基于身份密码体制(IBC)的电子招投标方案。

For the security need of the current electronic bidding, an Identity-based Cryptosystem (IBC) electronic bidding scheme is proposed.

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