Based on identifying the concept of surround-bidding and string-bidding, the essay analyzes surround-bidding, string-bidding, and damage in bidding, and puts forward countermeasures at bidding phase, so as to continuously improve quality and level of bidding.%在明确围标、串标的定义的基础上，通过对招标投标工作中存在的围标、串标现象和危害进行分析，在招投标各阶段工作中提出了应对的对策，从而不断提高招投标工作的质量和水平。
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