The occurrence and distribution of Panicum bisulcatum Thunb. in paddy fields in the rice-wheat continuous cropping area of northern Zhejiang were investigated. In order to provide reference for effective control to P. bisulcatum, the germination characteristics of seed, it's effects on rice growth and the sensitivity of P. bisulcatum plants to different herbicides were tested. The results showed that the relative abundance of P. bisulcatum was 0 to 2.8% in direct seeding fields and was 0 to 3.6% in machine transplanting fields. P. bisulcatum seeds could not germinate without light. The seeds germination rate was more than 90% immersed in GA3 with 1000 mg/L、500 mg/L or in NaOH with 0.2%、0.1% concentration for 12 h under the condition of 36℃（light 12 h）/28℃（dark 12 h）. There were significant differences compared with immersing clean water under same condition, which indicated that P. bisulcatum seeds had dormancy characteristics. The higher density of P. bisulcatum, the more obvious inhibition rate for the rice plant height and yield. The rice plant was reduced by 4.17% and the yield was reduced by 61.42% compared to the CK while the density of the P. bisulcatum was 125 per square meter in paddy field. Small or large P. bisulcatum plants were sensitive to metamifop and propanil Butachlor, however only small P. bisulcatum were sensitive to penoxsulam.