Background: Virtual lab training can give nursing students a safe clinical experience involving high risk conditions where access to intensive care units is limited. So, competent and safe intensive and critical care nursing is based on the knowledge, experiences and skills that can be acquired through several forms of simulation education such as virtual lab training. Aim: This study aims to assess the effect of virtual lab training for critically care nursing students on achievement competency basic skills. Design: A quazi experimental design was be utilized. Setting: At Faculty of Nursing -Ain Shams University at Cairo - Egypt. Sample: A purposive sample of (N. = 150) second year nursing students were be recruited in the current study. Tools: three tools were be used to collected data related to achieve the aim of the present study as following I- self-administrated questionnaire and II- Nursing students' observational checklist & III- Students' satisfaction scale regrading achievement competency basic skills post virtual lab training. Results: reveals that, the total competent level of students' skills through three times of observation was improved gradually, whereas 52.7 % of them had competent level of skills at first observation, 79.3% of them had had competent level of skills at second observation and 92.7% had competent level of skills at third observation. Conclusion: The implementation of virtual lab training had a significant positive improvement on achievement competency basic skills among critically care nursing students. Recommendations: Designing the virtual reality simulation programs can expand the nursing students' practice experience in safe virtual spaces and enhance their performance, self-efficacy and learning satisfaction.