Wenchuan earthquake triggered floods, landslide, collapse and secondary geological disaster, trigger a new soil and water loss, having the significant influence to the local river water quality. According to shaba and jiangyou station 2006 January to 2011 December flow and sediment concentration data for statistical analysis, this paper discusses the disaster area river water and sediment changes on the influence of river water quality before and after the earthquake. Results show that, the monthly average flow change trend does not take place obvious change before and after the earthquake, during the earthquake the monthly average sediment concentration is higher than any other in the same period of monthly average sediment concentration, jiangyou station and shaba station the average daily flow rate on May has no obvious change before and after earthquake, the earthquake for different regional influence is different, different regions of different section of the average sediment coefficient has certain space diversity, in jiangyou station the average sediment coefficient before the earthquake is more than the average sediment coefficient after the earthquake but the change of average sediment coefficient in shaba station was not significant before and after the earthquake.
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