Background & Aims: The purpose of the educational system of any country has got an utmostimportance. Several factors, such as thinking, learning styles, motivation, environment, family, community, quality of schools, the quality of the players can affect it. Learning and thinking is thefundamental aim of educational systems, and critical thinking is a favorable outcome related toeducation. Learning styles is also effective which can be achieved through experience and each personcan find his own learning style. The motivation of the students, is associated with their learning andacademic achievement. The aim of study was to investigate the relationship between learning styles"VARK" with the development of critical thinking, vitality and achievement motivation among studentsof Urmia University of Medical Sciences in the academic year 2015-2014.Materials & Methods: This is a cross-correlation study. The population of the study included allundergraduate students in Urmia University of Medical Sciences (2181).377 people were selected basedon Morgan and a multi-stage stratified random sample size. "VARK" as a survey of learning styles, Fleming and Mills (2004), and Watson Glaser as a critical thinking questionnaire, Form (A) (1980) ofDehghanizadeh and HOSSEINCHARI research as academic vitality questionnaire (1391) and Herman’s (1970) as achievement motivation questionnaire, and Cronbach's alpha (0.89) as the reliability criteriawere chosen.Result: The results showed that 68 percent of university students in Urmia University of MedicalSciences applied read and write style, 14 percent have auditory learning styles, and 12 percent usedvisual learning styles, and 6 percent applied other learning styles. A relationship was observed between"VARK" learning styles and vitality and achievement motivation. VARK learning methods contributed 87.1 percent, developing critical thinking 83.6 percent, liveliness 84.7 percent and achievementmotivation contributed 86.9 percent in the learning styles of the students of Urmia University of MedicalSciences.Conclusion: The results reinforced the learning styles of the students to develop critical thinking. Toreach the academic achievement, the vitality and motivation of the students in training centers shouldbe considered at its highest level.