Abstract: The water and fertilizer monitoring and scheduling system based on GA-PSO algorithm adopts cloud server, database and WDNK client as the framework of the system, using 4G IoT card module to transfer the fertilizer applied amount of the tank collected from PLC to the cloud server, the cloud server receives the fertilizer applied amount data and writes the data to Navicat database, and finally the WDNK client software displays the SN The information such as SN code and the amount of fertilizer to be added to the tank is displayed on the PC terminal through WDNK client software. The scheduling system, based on the latitude and longitude coordinates of the point where the water fertilizer tank is located and the demand, fully considers the own capacity of the transporting water fertilizer vehicle, takes the minimum path of the transporting vehicle distribution to each water fertilizer tank as the research goal, and uses the GA-PSO algorithm to reduce the driving mileage of the transporting vehicle while ensuring the amount of water fertilizer tank to be refilled, thus reducing the economic cost.