Owing to difficult topographic features of agricultural farms and livestock farms, golf courses, embankments of dams and many other large-scale projects, their development, re-configuration and maintenance of the ground covering grasses and lawns become impractical or impossible when the traditional conventional methods of seeding processes are applied. Therefore, the hydro spraying grass seeder has been developed in response to this demand on the one hand, and it is suitable for China current conditions on the other hand. This hydro spraying grass seeder consists of an internal-combustion engine, a mechanical mixer, a motored pump using water as its medium. It is attached to a motor vehicle (instead of being a self-driven one) and uses a sprayer to plant the seeds. The development of this hydro spraying grass seeder has solved challenging technical problems in mixing liquid materials with solid materials, hydraulic spraying and its control, etc. The testing and data analysis of this machine in many aspects, such as idle running without load, static hydraulic pressure, and performance when loaded and during discharging were made. Its development breaks a new ground in the grass seeding and spraying-planting engineering.