Problems in logistics networks and distribution systems, and the impact of external factors.

1. Problems with logistics network and distribution system: China Post EMS has the advantage of wide coverage, but this also means that the logistics network and distribution system are more complex. Any delay in the processing and delivery process will increase the overall delivery time.

2. Influence of external factors: Local logistics conditions, weather, traffic and other external factors affect the speed of postal e-commerce. These factors are difficult to predict and control and can lead to unstable delivery times.