Abstract: In order to improve the adaptability of clamping cotton seed precision dibbler to earth surface, a conclusion has been obtained that there were weightlessness and hypergravity through analyzing the main forms and values of the vibration of operating dibbler. The operation vibrations of the dibbler had great influence on seed clamping reliability. The seeds in the clamping port of the seeding devices could be clamped reliably in the condition of hypergravity, while they were unstable under weightlessness condition for the weight might rotate reversely, and seeds in the clamping port of the seeding devices would lose clamping power. The mechanism of the dibbler seeding devices was improved according to the research results. Experiment results showed that the rate of empty seed of improved dibbler declined from 9.3 percent to 2.6 percent. Therefore, the seeding properties of the dibbler were well raised, the affects of vibration on the dibbler were reduced, and the working reliability of the dibbler was obviously enhanced.