In This applicable research, investigating absorption of process of Erythrosine dye on Copper oxide Nanoparticles Adsorbent was studied. First, prepared dye concentrations of 6, 8 and 12 mg L-1. and the effects of parameters such as concentrations of initial dye, time and pH on dye absorption efficiency were investigated. The dye concentrations in different samples weremeasured via spectrophotometer (505.6 nmfor dye Erythrosine wavelength). The results of absorption studies showed that Erythrosine absorption or removal rates would increase with decreasing the primary dye concentration, increasing reaction time, and decreasing pHon the basis of the results, copper oxide Nanoparticles can the absorb Erythrosine dye appropriately and efficiency of the process is higher in acidic pHfor dye Erythrosine. Themaximumdye removal of 93.68%could be achieved at initial pH 2 using adsorbent dosage of 0.233gr in 50 ml (12 mg L-1 dye concentration) and agitation rate of 180 rpm. Effect of different parameters as kinetic parameters, were calculated pseudo-First and secondorder kinetic, the Langmuir and Freundlichmodels Isothermfor absorb of this dye on adsorbent. this results showed that second-order kinetic adherence possessing regression coefficient of R2 ï³ 0.999, absorption or removal of Erythrosine on Copper oxide nanoparticles and different parameters for investigating of process rate of absorption in to be this experience. Equilibrium data fitted well with the Langmuir model for dye with adsorbent.