Objective To investigate the asthma and the risk factors in the greenhouse-vegetable planter in Tangshan, Hebei province. Methods 1604 planter were chosen by cluster sampling and were investigated by questionnaire according to the standard of Chinese Medical Asthma Association (2003) during Jan.-June, 2006. Results 42 asthma patients were diagnosed, the prevalence rate was 2.62%, 1.78% in the male and 3.42% in the female. The family history, history of allergic diseases, upper respiratory path infection, smoking, kind of plant, pets were the risk factors. Conclusion The prevalence of asthma in the greenhouse-vegetable planters in Tangshan is related to the family history, history of allergic diseases, upper respiratory path infection, smoking, kind of plant, breed pets and working time.