For the two-stage supply chain inventory system which takes supplier as the core enterprise under the full information combining full permissible delay in payments with partial permissible delay in payments, and under the condition of delay in payments influencing order quantity, the strategy based on delay in payments from the perspective of supplier and order threshold is designed, and the conclusion that this strategy enable the system to achieve Pareto optimal profits is obtained. Finally, numerical examples on the relevant conclusions are verified and sensitivity is analyzed.