【正文】 of the claim period, but the cost should not be Claim. For instance, in the works in full swing during part of the project changes, construction has been finished on the part of the change and wait for the drawings when part of the construction and mechanical requirements of the claim, this time, to have been part of the End of the claim, it should benefit all, Including the costs and profits, but stagnation and machinery, due to the time when the construction season, it is entirely possible that this first part of the personnel, machinery to use elsewhere, to be paid should be the only change of duty and the types of work efficiency to lower costs. To deal with claims in the event of limitations should be carried out inspection, the 5 building of China39。s cost of the additional pensation expenses, in order to save his mitment should not be economic losses. 2. The cause of the project claim Engineering design arising from claims. As the construction drawings in error or defective, working drawings and the actual construction site in geology, environment, or the difference between the design drawings and specifications does not match the description of expression is not tight construction, equipment, materials, the name of the model specifications that Or the wrong amount of work is not clear and many other aspects of the flaws and omissions, resulting in rework. Inevitable in order to produce in the period, the labor, materials, and other aspects of the claims. Do not close the signing of the contract arising from claims The contract is a contract agreement, the tender documents, tender, contractspecific provisions, general provisions of the contract, drawings, BOQ and to fulfill the contract in the course of a series of supplementary agreements such as the position of the document, the contracts signed between the two sides in accordance with the law The entry into force, legally binding, either party may change or dissolve the nonperformance of the contract or the powers and duties. However, due to construction projects and the plexity of the construction period, as well as the natural environment, climate, such as longterm factors, together with the terms of the contract in terms of security is not strong, between the conflicting documents, are likely to make the parties enter into the Construction contracts can not take full account of all factors and a clear impact on the project, which led to the construction of the claim. The risk of accidents and unforeseen factors such as changes in the conditions of the claim During the construction process, changes in the conditions of the construction site of the project cost and impact, such as earthquakes, typhoons, war, rebellion, radioactive pollution and nuclear hazards, such as force majeure risks and natural disasters as well as the construction of sand mud emerged, geological Fault, natural cave, subsidence and underground structures or objects on the ground floor, and other unknown obstacles, often leading to the changes caused 3 by the construction claim. If excavation works due to the discovery of underground structures and cultural relics, and so on, the drawings did not say construction indeed difficult to foresee a reasonable manmade obstacles, such as the deal is bound to lead to an increase in the cos t of the project, the construction units can claim. Project construction contracts management changes in the claim. The current c