Objective To investigate the application of new portable vein visualizer in venous indwelling needle puncture in children.Methods A total of 432 children from January 2016 to June 2016 in pediatric department were randomly divided into observation group (n=224) and control group (n=208). Children in observation group received self-designed new portable vein visualizer in superficial venous indwelling needle puncture, while children in control group received traditional needle puncture. The one-time puncture success rate, puncture time, pain in children and family satisfaction were compared between two groups.Results The success rate of observation group (95.1%) was significantly higher than control group (73.1%) (χ2=39.881, P<0.05). The puncture time of observation group was shorter (3.400±0.615) than control group (4.850±0.873), with statistically significant difference (t=9.608,P<0.05). The family satisfaction in observation group (96.1%) was significantly higher than control group (85.2%) (χ2=7.037,P<0.05).Conclusions Application of new portable vein visualizer in superficial venous indwelling needle puncture in children improves the success rate, decreases the puncture time, reduces the pain of children and improves family satisfaction.