Abstract: The complex organic of P507-N235 can extracts and separation rare earth well.In order to use the acid-containing complex organic of P507-N235, it was used to decomposition of Rare earths in this article. The optimal process parameters were determined by the experiment of neodymium carbonate decomposition with acid-containing organic phase:the feed concentration is 72.5 g/L、the leaching time is 30 min、the phase ratio is 1:1, under these conditions, the extraction capacity of Nd is 20.16 g/L, The organic phase over acid utilization rate is 52.6% and this process has a good phase separation.For the neodymium hydroxide decomposition with acid-containing organic phase, under the optimal process such as the feed concentration is 73.3 g/L、leaching time is 50 min、phase ratio is 1:1(Volume ratio of the organic phases and aqueous phases), the extraction capacity of Nd is 21.6 g/L, the organic phase over acid utilization rate is 53.7%.Experiments demonstrated the feasibility of this scheme, the acid-containing organic phase can realize recycle and the effect of acid utilization is better.