翻译下列文献摘要(英译汉) Nowadays in the engineering construction industry, the market which is characteristic for project bidding, has formed. The construction companies,which want to create good benefits, have to control their cost and improve management to enhance the capacity of adapting and competing in this market. This article focuses on how to decrease cost and increase income so as to control the construction cost effectively. bidding documents should be well formulated ,which is important to a successful bidding and direct influence the success or failure of the bidding work.Because the success or failure of the bidding for the survival and development of enterprise has a direct impact, so we have a high quality, improve the bid documents of the unit, prevent invalid and successful pass mark appear, become a research topic.