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The decline rate of core body temperature can be reduced by perioperative care such as prewarming (the application of heat to patient’s body prior to surgery) for 30 minutes and by using a water warming pad during surgery. The purpose of this study was to determine the effectiveness of prewarming and water warming pad to reduce intraoperative temperature decrease on spinal anesthesia. This study was conducted by a single-blind randomized controlled trials method involving 30 patients in central operating theatre Dr. Hasan Sadikin Hospital-Bandung within May–July 2013 were classified into three groups, the group of prewarming patients performed for 30 minutes and were using water warming pad during surgery; the group of patients without prewarming and were using water warming pad during surgery; and the control group. Core body temperature on tympanic membrane was recorded every 15 minutes from the initial induction through the end of operation. The result data were analyzed by using chi-square (χ2) test, t test, Friedman Test and ANOVA test, in which the value of p<0.05 was considered significant. Average core body temperature of the prewarming and water warming pad group was 36.62 °C (p=0.023), the water warming pad group was 36.24 °C (p<0.001), and the control group was 35.94 °C (p<0.001), this result statistically significant. The conclusion of this study is prewarming prior to surgery and the use of water warming pad during surgery could reduce temperature decline rate during operation.