The basic structure and work principal of the type 9BQS—3.0 pneumatic scarifying and sowing compound operation machine were introduced. The general structure, shallow scarifying device, press roller and metering device were designed and computed. The experiment results indicated that the seeder had good performance and reasonable structure. The soil broken rate was 94.5%. The bulking intensity of shallow scarifying layer was 63%. The seed broken ratio of elymus dahuricus was 1.2%. The seeder could perform the compound operation of scarifying, furrowing, seeding, covering soil and flatting simultaneously.