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For the existing traceability model could not express the mixing process quantitatively, the uncertain data were brought into traceability system and the model based on these uncertain data was built up. A traceability inquiry method using uncertain data was proposed. The multi-source tracing problem was solved by using basic representation and inquiry method of uncertain data. The functions of simple inquiry, node evaluation and single node abnormal deduction were achieved based on the proposed model and the solving method of multi-node abnormal deduction was presented.