The purposes of this research were to study the factors of service qualityaccording to inpatients' expectation and the variable which described those majorfactors, regional hospitals and medical centers, southern region. A sample of 740inpatients in regional hospitals and medical centers, southern region, were randomlyselected through multi-stage sampling technique. The instrument, a rating scale onfrequencies of inpatients' expectation of hospital service quality, was developed bythe researcher. The reliability of the instrument, calculated by the Cronbach AlphaCoefficient was .9562. The data were analysed by Image Factoring method withOrthogonal rotation through Varimax method. The major findings were as follows :Six significant factors of service quality as expected by inpatients in southernregion were determined. The total variances of all factors is 54.8 percentaccumulative. The following factors derived from the calculated variances were: 1)Expectation on courtesy and ethic, a major factor of expected service quality, whichdescribed by 18 items, accounted for 38.9 percent of total variances, 2) Expectationon credibility and rapidity, which described by 21 items, accounted for 4.7 percentof total variances, 3) Expectation on tangibles, which described by 13 items,accounted for 3.9 percent of total variances, 4) Expectation on prices, whichdescribed by 7 items, accounted for 3.2 percent of total variances, 5) Expectation onhealth education, which described by 4 items, accounted for 2.2 percent of totalvariances, 6) Expectation on convenience, which described by 4 items, accounted for1.9 percent of total variances.