OBJECTIVES: The aim of the study was to assess nursing care and service safety and its effective factors as well as identify improvement approach in the future them. METHODS:  We adhered in our study the guideline on treatment and diagnose of common disease of Mongolia, health technology MNS46215208 treatment and diagnostic common  acts, policy on develop human resource in the health sector 2010-2014, strategic directions of nursing and midwifery care and service 2011-2015, WHO guideline and standards. RESULTS: This study has involved 418 nurses who work in the hospitals I, II, III level of the capital city and countryside and 0.2% (5) of them were men and 99.8% (413)were women. Percent of nurses who participated in the study was 80.6%, 97% of nurses who work in the hospital I level and 58% of the nurses who work in the hospital II level as well as 47% of nurses work in the hospital III level are only giving injection (p<0.05). CONCLUSIONS: Nurses’ work and obligation often based on documents and 80% of the work is spent for giving injection. Thus nursing care can not be serviced in the very essence. Nurses’  average grade of  general knowledge was 56.8%. nurses had 43.4% who work in the hospital I level, nurses had 50.1% in the hospital II level and nurses had 78.9% in the hospital III level. It shows that rising hospital level, their knowledge is even rising (p 0.001).Nurse’s job  description which is adhering in Mongolia is not expedient. Their work schedule and obligation have to be reformed. Nurse’s salary, supplement, work environment and social issue should be considered and decided as well as promote sustainable work environment.