Regarding the importance of choosing a right partner as a base of starting family and consequently creation of a safe community, the present study aimed to determine the criteria of choosing a partner from the point of view of the unmarried students of Semnan University of Medical Sciences. In this study, loyalty, ethics and commitment to principles, personality traits, compatibility and ethical similarity were the top 5 prior criteria, respectively which are subcategories of psychological- social criteria. These findings are consistent with those of other studies in which the above-mentioned criteria are considered as the most important priorities in choosing a partner. The study by Todosijev (2003) in Serbia showed that loyalty is the first and honesty, mercy, confidence, love and caring are of the second priority. Heydari (2006) from Mazandran University of Medical Sciences mentioned ethical understanding, loyalty, accountability, and love as the most important criteria , Harazi (2001) from Yazd University of Medical Sciences (Shahid Sadooghi) stated faithfulness to the religious tasks, being good tempered, accountability and loyalty in his research (
12,
14,
15). We can conclude that today, in most countries throughout the world, one of the key factors of divorce is lack of loyalty and the main concern in the marital life is loyalty and commitment to the ethical and social principles, which was suggested in both Farsi and English studies mentioned above. The findings of this study showed that there is a significant relationship between gender and 17 criteria of 30 criteria. First five criteria for boys are loyalty, commitment to ethical principles, compatibility, personality traits, accountability and ethical understanding and for girls, loyalty, and commitment to ethical principles, love, personality traits/ethical understanding and compatibility are important which there was a significant difference, regarding three priorities, between the girls and boys conceptions. Totally, the psychological-social criteria (loyalty, accountability, Personality traits, sociability, compatibility, nobility, common culture, common language, mutual respect, financial status) and aesthetic criteria (beauty, charm, skin and hair color, physical appearance) are important for girls and boys, respectively, which is consistent with studies by Mosalanejad from Jahrom, Heydari from Mazandaran, Nasirzadeh from Tehran, Sharafkhani from Ilam, Rezaean from Toyserkan, Feingold and Schafer from America suggest that boys regard the aesthetic criteria, physical appearance as the first priority and social criteria as the second priority while emphasizing on the mental and social criteria with respect to the emotional sensitivity (
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6,
9,
12,
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18). The point of view of students about the partner's job suggests its relationship with gender and education level of students. Most female students with B.A prefer staff husband and male students with PhD prefer a wife majoring in the same course and colleague that are consistent with the results of the studies by Heydari from Mazandaran and Harazi from Yazd. Clarifying this result, we should conclude that the mutual understanding with a partner affects on consistency of university major and job and with respect to the type of job, accountability of medical staffs and their social status, it seems that having a colleague partner is the best choice but lack of opportunity to play the parental role in family for the medical staffs is a thread for reinforcement of family, in this case, we should predict some basic strategies such as accepting more responsibilities from partners and planning the working timetable for medical female staffs in order to prevent disorder in their role in family (
12,
15). Based on the results of researches done, most students intended to choose a partner whose education level is higher or at least the same level. This perspective was common among the female students but for the male students, the same level of education and lower education level is important. These findings are consistent with the results of study by Forodastan from Isfahan, Heydari from Mazandaran, Haghighi zadeh from Ahvaz and Maliki from Nigeria. From these findings, we can conclude that the criterion of education level is one of the key criteria for choosing a partner. The studies of Baru and Byron (2004) and Myers (2005) suggest the direct relationship between mutual satisfaction and education similarity because this consistence can be a key factor of understanding between the partners. This finding suggests the attitude of educated female students in choosing a proper partner and with regard to daily increasing of this population with this viewpoint, we should acculturate in a manner that the criteria of higher education level won't be replaced by the key and sustainable criteria and on the other hand, we must provide the interest for boys to further their higher education (
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8,
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19).In this study, most students regarded the age difference between 2 and 5 years and girls prefer to choose a partner older than they are; this was consistent with the results of the study by Heidari from Mazandaran stating the age difference of 3-4 and of Mosalanejad stating the age difference of 3-5 years (
4,
12). The socio-cultural roots and early physical and mental maturity in girls and the chance of fertility can confirm the belief that girls should be younger, but the least age difference should be considered because it can affect on the rate of satisfaction and mutual understanding (
6). Most students considered emotional needs as a key factor for marriage which is similar to the results of findings by Harazi from Yazd and Shahriari from Ardestan (
15,
20) and just 5.5 % of students considered performing religious assignments essential for marriage while in the study by Hamidzadeh Arbabi, 25% of students in Ardabil mentioned the marriage as a fundamental issue (
7). These findings may suggest that something must be done for enhancing the divine belief toward marriage by media and official education. Most students regarded the high expectations and financial problems as the main hindrance to marriage. Financial problems and fear of poverty after marriage impede marriage as shown in the study of Hamidzadeh Arbabi from Ardabil and Shahidi from Kordestan, which is consistent with our findings. Although according to some psychologists such as Mazloo, essential needs are the bases for mental and psychological needs, Islam ordered not to delay the marriage due to the financial matters and relay on God's favor because God is bountiful, as in He said: God will bestow his bounty in case they are poor (
2,
7,
21). Most students prefer to consult with their family when they are about to choose a partner and consider the satisfaction of their family and spouse so important and they consult less with their friends in this regard, which is consistent with the study by Heydari from Mazandaran, Harazi from Yazd and Haghighizadeh from Ahvaz, but despite the fact that marriage and choosing a partner are personal issues, importance of family satisfaction for the students suggests the significant role of family for guiding their children to make decisions and training family to give consultation and guidance can be helpful (
8,
12,
15). Most students regard premarital cognition and its effect on successful marriage significant which is consistent with the results of the studies by Harazi from Yazd and Haghighizadeh from Ahvaz. This finding suggests that the youth needs premarital cognition to find the required criteria for starting family successfully along with understanding, but this cognition must be acquired through guidance by family (
22). Failing to care about answering the questions can be a restriction in this study and it is recommended that the studies be done on the criteria of choosing a right partner from the point of view of non-medical students and non-students and the results related to the criteria be compared between the students majoring in medicine, and the other fields; on the other hand between the students and non-students. Based on the above findings, we can conclude that the students participating in this study consider some psychological and social criteria for choosing a partner and it suggests that the students know the sustainable criteria for partner choosing, so we should provide opportunity to prevent from problems of choosing based on these criteria, so we should invest on educating loyal, good- tempered, committed to the social and ethical principles, accountable and compatible individual. As these traits are shaped in family and society, they should pay attention to them and acculturation should be done.