Study aim: The effectiveness of stress-based online mindfulness training on the mind health & the quality of work lifeof nurses working on the front lines of the fight against Covid-19 Design: A phase-blind, randomized, single-sided (data analyzers) clinical trial will be performed on 36 nurses working on the Covid-19 frontline. A table of random numbers will be used. Settings and conduct: This project will be carried out in Taleghani Educational and Medical Center affiliated to Urmia University of Medical Sciences and the intervention group will be trained online at home for 8 weeks. Participants/Inclusion and exclusion criteria: Full time employee. At least 2 years of service. At least 3 months of work experience in the "ICU" department (due to adaptation to the work environment). Absence of acute psychiatric illnesses such as psychosis. If medical drugs are used, the dose of the drug is stable during exercise and if the dose is changed, inform the researchers. Not addicted to drugs and alcohol. Lack of previous experiences of mindfulness.Do not receive any psychological interventions and counseling during exercise from other sources. Absence of acute physical illness with pain that prevents exercise. Exclusion criteria also include the absence of more than 10% of the training time, leave and cause with a major stressful event (including coronary heart disease, imminent death, divorce, etc.) in the existence of research has it. Intervention groups: Intervention group: including nurses working on the front line of the fight against Covid-19 who will participate in a stress-based mindfulness training program for 8 sessions. Control group: including nurses working on the front line of the fight against Covid-19 who will participate in a stress-based mindfulness training program after completing the research. Main outcome variables: Mental health Quality of working life