【正文】 improve. This project bidding documents in accordance with the bidding law of the People39。s macro regulation and control, enterprise autonomy offer, the market will price principle, to implement the implementation specification bill of quantity. Inventory Valuation bidding activities are based on market economy mechanism, based on legal, scientific, fair, open and reasonable way to determine the winning bidder of an economic activity. Bidding is bidding activities constitute two basic aspects. The bidding activity is merely that by bidding to choose the one with the work Construction process capability, moderate cost, quality is excellent, short duration of construction enterprises, and this is the ultimate goal tender. I have participated in internships over the course of the project bidding, and pleted over part of the calculation of quantities, bined with graduate experience in the design process, a brief analysis of the mode Quantities Call for Tender The meaning of risk and risk characteristics of the general construction, the lowest price sealed bidding construction method produces several risks and incentives, according to their characteristics discussed the feasibility of risk control and prevention. Comparison of engineering and engineering security risk management, insurance, similarities and differences between the two projects and benefits。s accession to the WTO, the global construction industry a powerful tool for peer petition. A healthy bidding system should be in accordance with the open, fair and justice and the principle of good faith, and establish a unified, open, petitive and orderly construction market. In view of the current problems existing in the bidding process, adopt regulations, and formulate and perfect the institution, strengthening process supervision measures, they can better regulate construction market order, prevent corruption from its source, purify construction market, promote the construction market order progressively toward standardization, institutionalized, and constantly improve the quality and level of the bidding work. References [1] . Casey, . Ferguson, Intelligent forms processing, IBMSystem Journal 29 (3) (1990) 435– 450. [2] T. Watanabe, Q. Luo, N. Sugie, Layout recognition of multikindsof tableform documents, IEEE Transactions on Pattern Analysis and Machine Intelligence 17 (4) (1995) 422–445. [3] . Chen, . Lee, An efficient algorithm for form structureExtr ction using strip projection, Pattern Recognition 31 (9)Fig. 9. Table with no obvious separating symbol between records. (1998) 1353– . Cao et al. / Automation in Construction 11 (2020) 573–584 583 [4] . Tseng, . Chen, Recognition and data extraction of form documents based on three types of line segments, Pattern Recognition 31 (10) (1998) 1525– 1540. [5] . Fan, . Lu, . Chen, A feature point clustering approach to the recognition of form documents, Pattern Recognition 31 (9) (1998) 1205–1220. [6] S. Chandran, R. Kasturi, Structure recognition of tabulated data,Proceedings of 2nd International Conference on Document Analysis and Recognition, Tsukuba Science City, Jap20– 22, 1993, pp. 516– 519. [7] K. Itonori, Table structure recognition based on textblock arrangement and ruled line position, Proceedings of 2nd International Conference on Document Analysis and Recognition, Tsukuba Science City, Japan, Oct. 20– 22, 1993, pp. 765– 768. [8] . Shamilian, . Baird, . Wood, A retargetable table reader, Proceedings of 4th International Conference on Document Analysis and Recognition, Ulm, Germany, Aug. 18– 20,1997, pp. 158–163. [9] . Chiang, . Tue, . Leu, A new algorithm for line image vectorization, Pattern Recognition 31 (10) (1998) 1541–1549.