In order to explore a technology of producing organic fertilizer by composting with the urban forest litter and river sediment treated with fly ash passivation,an experiment was conducted to study dynamic changes of several parameters including temperature,pH,organic matter,C/N and germinationindex(GI)during hightemperature composting of the urban forest litter and river sediment with five proportions(1∶1,1∶2，1∶3,2∶1 and 3∶1).Results showed that the temperature and pH followed a riseandfall trend;the sedimentlitter mixed disposal with the ratio of 3∶1 heated up quickly,and had the longest hightemperature duration(5 days).At the end of the composting,all disposals achieved the decomposed status,pH were among 7.47 to 8.87,the organic matter fell by 36%,38%,42%,33% and 29%.Rising ratios of urban forest litter was conducive to reducing the loss of organic matter.Due to the low C/N of river sediment,increasing the proportion of urban forest litter was helpful to improve the efficiency of composting.The GIs of the first,fourth and fifth disposals reached 80% at 26 d,18 d,and 19 d respectively,but GI of the second and third disposals did not reache this level until the end of composting.Considering the quality of fertilizer and efficiency of composting for largescale production,the proportion of sediment and urban forest litter was suitable at 3∶1 ratios,as to be the raw materials of organic fertilizer.