Abstract: Reliable measurement and control devices for multi-purpose applications were designed for precision agriculture.Some major breakthrough were achieved in some respects about large-scale real-time variable rate fertilizer technology，automatic weed identification technology based on computer vision technology and combines real-time detection technology of production.Combine grain flow measurement methods with our own intellectual property had been established.Our original practical products about smart on-line rice transplater and automatic variable rate fertilizer applicator had been produced.Tests showed that these products have high technology，low cost，high accuracy and usefulness of a strong overall advantage.Tests showed that these products have high technology，low cost，high accuracy and usefulness of a strong overall advantage.