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AFDX uses Virtual Link to realize the logical separation of the physical bandwidth resources. The delay jitter on virtual links is caused by asynchronous arrival and multiplexing output of data frames, which also leads to the uncertainty in the end to end delay analysis. In this paper, a method of network calculation based on jitter test was proposed. The network transmission jitters on VLs have been caught by distributed test. On the foundation of the testing results, a precise flow model was established, and with the stepwise correction of the flow model, the end to end delay was corrected gradually. By combining the actual value of jitter with the theoretical analysis results, a visual result of the network calculus pessimism and its diffusion effect was proposed. This result improves the compactness of the network delay calculation.