Abstract: At present, ecommerce and express delivery are interdependent and supporting each other Their business cooperation becomes increasingly close and their relevant areas continue to expand Based on the statistics of historical development of ecommerce and express delivery, the grey relational theory is used to analyze the correlation coefficients between ecommerce and express delivery Then the symbiosis theory in the field of biology and the Logistic model are used to study the symbiotic relationship between ecommerce and express delivery In addition, the symbiotic integration model is quantitatively studied between ecommerce and express delivery, and the symbiotic model is employed to study the correlation between the two Finally, the study shows that the two are more consistent with asymmetric reciprocal symbiosis

Key words:  , ecommerce and express delivery, grey relational theory, symbiotic integration, Logistic model