Background & purpose: In the health sector, in addition to the important consequence of treatment, health system should meet the expectations regarding the desirability of services. Expectations and perceptions of patients about the desirability of services play an important role in selecting hospitals, their loyalty to the organization & replanning to purchase. Thus the present study has been done with the aim to determine the relationship between services desirability and patients’ tendency to public or private hospitals in Sari. Materials & Methods: This study is a descriptive and analytical type done in ۲۰۱۲ in four private and public hospitals located in Sari. The study population consists of hospitalized patients that have been subjected to inquiry by using ۳۶۱stratified random samples. The survey tool was questionnaire that its validity was judged and approved by the teachers and its reliability was obtained by alpha Cronbach as ۰.۹۷۲. The collected data was analyzed by SPSS software, independent t-test, t-sample test and descriptive statistics. Results: Findings show that in services cost indexes, there are not any significant differences between public and private hospitals while in the other services desirability indexes such as accessibility, availability, speed, quality, and complete package of services and …, there is a significant difference between public and private hospitals. Conclusion: In patients’ tendency to hospitals, utility service indicators satisfy a significant impact. So, codified planning to improve these indexes in order to absorb more patients by authorities is required.