(The network solution technology is to use a directed network graph to express the sequence of each office in a plan and the logical relationship with each other; then calculate the time parameters to find out the key routes and available maneuvering time in the plan; in accordance with certain optimizations policy, and constantly improve and optimize the plan arrangement, so that the plan can reach the overall optimization; and in the process of plan implementation, through review, control, and adjustment to ensure the plan's policy is realized on schedule)