1. The content is different: the project cost mainly includes construction cost, installation cost and construction (public) equipment cost. Construction and installation costs include construction and installation engineering costs, including labor costs, materials costs, construction machinery use fees, enterprise management fees, profits, handling fees and taxes.

2. Different investment composition: the project cost is the total cost of a project construction, including construction and installation cost, preparation cost, machinery purchase, loan interest and pre-project cost. Jian 'an expenses are only a part of the total investment of construction projects, mainly including labor costs, materials costs, construction machinery use fees, enterprise management fees, profits, handling fees and taxes.

3. Different scope: the project cost includes the construction cost (civil engineering and installation specialty), highway engineering cost, water transportation engineering cost, railway engineering cost, water conservancy engineering cost, power engineering cost, communication engineering cost, aerospace engineering cost, etc. Jian' an fee mainly focuses on the cost of construction and installation.