The extractability, bioavailability and/or toxicity of water-soluble exogenous Cu (Cu added to soils) decrease with the contact time, which is termed as “aging”, which means a great difference in the Cu bioavailability between field contaminated soils and freshly spiked soils, thus, it is very necessary to understand the aging process of Cu in the assessment of ecological risk and the establishment of environmental quality criteria, moreover, it is also helpful in guiding the management and remediation of contaminated soils. This paper was reviewed detailedly the mechanisms and influential factors for the aging process of exogenous Cu in soils, and it was concluded that the aging process of exogenous Cu was mainly controlled by diffusion, surface nucleation/precipitation and occlusion, and micropore-diffusion played the dominant role during long-term aging; the main influential factors of the aging of exogenous Cu included soil pH, temperature, organic matter and soil type, where pH affected surface nucleation/precipitation and diffusion, temperature affected mainly diffusion, and organic matter affected all reactions mentioned above. Also in this paper some perspectives for further research in this field were presented.