Introduction   The urgent purchase of the equipment and material in the power plant will highly threaten the schedule of the project. In order to reduce the occurrence of the urgent purchase so as to lower the risk of blocking the erection schedule due to material omissions, this paper aims to summarize the common omissions and their cause in the executed projects.

    Method   To search for the common omissions, we collected the opinion of the construction professionals using interview method, and explored the cause of the omission using fishbone diagram.

    Result   The result we obtained demonstrates that the engineer′s ignorance, the unclear scope of the main equipment, and confusing range of construction contract are the top main cause of omissions.

    Conclusion   Thus, Omissions of the procurement can be avoided to the utmost extent from the very early contract phase by organizing the procurement package in a reasonable way.