Cu-Sn-Zn alloys are excessively utilized in different manufacturing applications due to their unparalleled advantages, such as very its low resistivity, altitude business strength, and premium weldability. Sn-4Zn alloy is concerning to the lead-liberation arrangement which is favorable in respect of the comparatively minimal fusion degree and minimal price. Nevertheless, Zn displays destitute oxidation and corrosion resistance which prevent welding employment. The present research studied the addition effect of Cu and CuO nanoparticles (NPS) on the transient creep properties of the Sn-4Zn alloy. Three compositions of Cu-Sn-Zn alloys were studied Sn-4Zn, Sn-4Zn-0.4CuO (NPS), and Sn-4Zn-1.5Cu (NPS). X-ray diffraction (XRD) and Scanning Electron Microscopy attached with Energy-dispersive X-ray spectroscopy (SEM-EDX) were used to investigate the microstructure of the prepared alloy samples. The results proved the addition of 0.4 CuO (NPS) to Sn-4Zn alloy increased the strength of the alloy by about 11%, while the addition of 1.5 Cu (NPS) increased the ductility of the alloy by about 14%. Additionally, the Creep property for Sn-4Zn; Sn-4Zn-0.4 CuO (NPS), and Sn-4Zn-1.5Cu (NPS) alloys is investigated during distinct employing temperatures, three degrees extended between 303 until 373 K and under seven varied fixed utilized stresses (σ) from 10 MPa to 24 MPa. The results showed the magnitude of β and n is distinctly linked to the creep test circumstances (T) and stress (σ) as εtr = βtn. The coefficients (n) is raised by rising (T) regardless of the utilized stress (σ); while (β) is reduced by growing (T) and /or stress (σ).