This report discused the origination of primary inf ection,disease symptom and resistant hereditory feature of MDMV.We analysed the cause of MDMV occurred in middle shanxi basin in 1998.

• 本文从玉米矮花叶病的初侵染来源、发病症状和抗性遗传特性，分析造成山西中部盆地1998年玉米矮花叶病大发生的原因。