Objective To evaluate the clinical value of three-dimensional color power angiography (3D-CPA) in the diagnosis and differential diagnosis of renal tumors.Methods ATL HDI-3000 ultrasonic system with C4-2 superwide frequency transducer was available. 38 cases with different pathological types of renal tumors were examined with 3D-CPA. The vascular pattern of renal tumors and vascularity index (Ⅵ) were assessed.Results The vascular pattern of 3D-CPA Ⅲ was shown in 23 renal cell carcinomas (RCC), 3D-CPA Ⅱ in 9 RCCs. The sensitivity and specificity of 3D-CPA Ⅲ in diagnosing RCC were 71.9% and 100% respectively. 3 of 6 benign renal tumors appeared to be 3D-CPAⅠ.Ⅵ was 0.3418±0.1556 counts/cm3 in RCCs and was 0. 1948±0. 0573 counts/cm3 in benign tumors. There was a significant difference of Ⅵ between malignant and benign tumors. When Ⅵ was more than 0.25 counts/cm3, the sensitivity and specificity in diagnosing kidney malignant tumors were 72.2% and 83. 3% respectively.Conclusion 3D-CPA is able to cle Objective To evaluate the clinical value of three-dimensional color power angiography (3D-CPA) in the diagnosis and differential diagnosis of renal tumors. Methods ATL HDI-3000 ultrasonic system with C4-2 superwide frequency transducer was available. 38 cases with different pathological Types of renal tumors were examined with 3D-CPA. The vascular pattern of renal tumors and vascularity index (Ⅵ) were assessed. Results of The vascular pattern of 3D-CPA III was shown in 23 renal cell carcinomas (RCC), 3D-CPA II in 9 RCCs. The sensitivity and specificity of 3D-CPA III in diagnosed RCC were 71.9% and 100% respectively. 3 of 6 benign renal tumors were to be 3D-CPA I was 0.3418 ± 0.1556 counts / cm in RCCs and was 0 There was a significant difference between Ⅵ between malignant and benign tumors. When Ⅵ was more than 0.25 counts / cm3, the sensitivity and specificity in diagnosing kidney malignant tumors were 72.2% and 83 3% respectively.Concl usion 3D-CPA is able to cle