【Objectives】 To test the expression levels of soluble CD147(sCD147) in plasma of psoriasis vulgaris(PV) patients and normal controls. Describe disease severity of PV with psoriasis lesion degree score(PASI) and analyze the correlation between the expression levels of sCD147 in psoriasis patients and disease severity. To test the expression levels of sCD147 in plasma of different subtypes of psoriasis patients, and study the roles of sCD147 play in the psoriasis classification. 【Methods】 Detect the expression levels of sCD147 in 74 PV patients and 41 normal controls by enzyme-linked immunosorbent assay(ELISA). Analyze the correlation between sCD147 expression levels and PASI score. Detect the expression levels of sCD147 of plasma in 10 patients with psoriasis pustulose(PP), 12 patients with arthritis psoriasis(PsA) and 7 patients with psoriasis erythrodermic(PE). Statistical analyze the difference of sCD147 expression levels in patients with different subtypes of psoriasis. 【Results】 The sCD147 expression levels in plasma of PV patients were significantly higher than those in normal controls(Ctrl)(P 0.01). Statistical analysis showed that there was no correlation between sCD147 expression level and PASI score(r =0.123, P =0.298). There was significant difference of sCD147 expression levels in different subtypes of psoriasis patients(PV PP PsA PE)(P 0.001). 【Conclusion】The expression levels of sCD147 is significantly increased in psoriasis patients. There is statistical significance of sCD147 expression levels in four subtypes of psoriasis. Thus, sCD147 may become a new target for psoriasis drug treatment.