Objective To study the value of improving image quality and radiation dose of abdominal CT by the technology of intelligent best tube voltage (CARE kV). Methods A total of 80 cases from April 2012 to April 2015 in our hospital received abdominal CT scans were selected for study, which were randomly divided into observation group and control group with 40 cases in each group, the control group was used conventional filter back projection method and CARE DOSE 4D for image processing, while the observation group was used iterative reconstruction algorithm and CARE kV technology. The effective radiation dose level, scanning, static arterial phase SNR and CNR level enhancement were compared respectively. Results Observation group of effective radiation doses of ED, CTDIvol and DLP level were significantly lower than the control group. Observation group on arterial phase scanning, the SNR of livers, pancreatic SNR and CNR, kidney SNR and CNR, and abdominal aorta in SNR and CNR level were markedly higher than those in the control group. Observation group’s venous phase scanning of liver SNR and CNR, pancreatic SNR, kidney SNR and CNR, and portal vein SNR and CNR level were markedly higher than those in the control group, the differences were statistically significant (P<0.05). Compared two groups of arterial phase scanning of liver CNR and pancreatic venous phase scan CNR, there was no statistically significant difference (P>0.05). Conclusion The CARE kV technology of abdominal multi-slice CT image signal to noise ratio and effective radiation dose has good effect, obviously for the improvement of image quality, high security, which is worth for clinical examination in the process of popularization and application.