The previously developed industry has contaminated part of groundwater and soils in Wenzhou with high concentration of Cu²⁺ in waste water, such as tannery, electroplating and etc. To study the characteristics of typical Wenzhou soft clay with Cu²⁺, the soil samples are remodeled to test the electrical resistivity with different concentrations of Cu²⁺ and reasonable amount of cement for consolidation. Electrical resistivity tests were carried out via the self-designed one-dimensional consolidation compression apparatus. The resistivity variation can be directly observed during the compression process. The testing results indicate that:while the concentration of Cu²⁺ and water in soil is high, electrical resistivity measurement should not be applied to assess the compression process of the soil. However, this measurement is a good indication for characteristics changes in soil after adding cement. Therefore the electrical resistivity might be taken as an effective means to estimate the degree of contamination of soil in practical engineering.