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Unforeseen events have a great role in causing personal and financial losses each year around the world. Nowadays, one of the important problems in maintaining human and material resources and countries development is the natural or unnatural disasters that the correct management weaknesses in order to control and deal with them, lead to an increase in the amplitude and the range of damages caused by the crisis. Due to the large number of running civil projects in Iran and the high number of accidents in these projects, paying special attention to the planning and crisis management in construction projects come to importance more than ever. The purpose of crisis management is to regulate and coordinate the integrated measures of responses and reactions toward crisis in order to prevent or minimize the risk, if it is possible and rapid and effective reaction if it is not possible to prevent the catastrophic event, and help to normalize the situation, as soon as possible. Therefore, firstly, in this paper, it has been investigated the main common weaknesses indifferent patterns of crisis management and accordingly, the special questionnaire of land subsidence of Mahshahr petrochemical zone was designed and it was distributed among the statistical society of officials, managers and specialists of the different regionals and by the analysis of the responses, this result conducted that the effects of land subsidence crisis have 40- to 60% impacts on the civil projects in terms of time, cost, timetable schedule delays, etc., that it is recommended that the problems should be solved by establishing crisis management in civil projects of all parties.