The design process of customized products involves dynamic feedback on customer requirements, design alterations, design knowledge, and other information. Current technologies for designing customized products focus on implementing product functions, but are short of effective support for design information feedback. The paper introduces a feedback technology of customized product design information based on tentative design chain reconstruction, whereby a tentative design chain and a corresponding design assignment matrix (DAM) are built in accordance with the logical relationship between the design assignments of the customized product. The tentative design chain is reconstructed through matrix decomposition to optimize the implementation path of the design assignments. Based on the reciprocal relationship between information transfer and feedback path for the design of a customized product, the feedback path of the customized product design information is extracted. The implementation method for feedback are put forward so that the design strategy of the customized product can be adjusted promptly with the feedback information between assignments. The feedback technology of the customized product design information based on the tentative design chain reconstruction is verified by application in the design of the elevator traction sheave. The results show that it helps to reduce the degree of the cross correlation between design assignments, and simplifies the design process of the elevator traction wheel.