On the basis of equal cooperation between project-based enterprises,the fairness preference theory was applied to constructing project-based supply chain cross-organizational bidirectional incentives model from the view of maximizing project value-adding,thus an analysis was made of the influence of project-based enterprises’ effects level,fairness preference degree and project value-adding allocation coefficient on project-based supply chain project value-adding,and then the related digital simulation and example analysis were presented for the purpose of proofing the model theoretical analysis conclusions.The results reflect that,while under the condition that project-based enterprises have fairness preference,the project-based supply chain implemented cross-organizational bidirectional incentives strategy not only can achieve project value-adding maximization,which prompts project-based enterprises allocating resources and efforts level reasonably,but as well realize project-based supply chain benefits improvement and payment cost reduction between the cooperative partners.