Abstract: In recent years, Qiantang III fruit sugar cane emerged some diseases during production every year. The serious infected sugarcane fields diseases have to probe into this cure technique , we have made an investigation and judgment on Qiantang III fruit sugarcane .We mainly passaged to observe many sugarcane fields and knew, Then made a common research way of flant diseases, Filst, We synthe ticly analyzed organizing PDA chltvation to steritized dvseases separating pathogene apprise ment by mirror etc. and found six diseases, Pellicularia sasakii(shirai)I to and Cochliobolus stenospilus (Drech). Mat. And yam and Mycovellosiella koepkei (krüer) serious harm plant. We introduced six diseases harm symptoms in plant and feature of pathogen and characteristic, advanced five countermeasures of prevention and cure.