To know considerable factors to make decisions such as surgical intervention or conservative treatment in patients of hemoperitoneum, corpus luteal cyst rupture. We conducted a retrospective review of the patients diagnosed hemoperitoneum with ruptured corpus luteal cyst in Kyungpook National University Hospital in Daegu, South Korea between January 2010 and March 2015. We divided into two groups, surgical intervention or conservative treatment, compare with clinical characteristics, vital signs, laboratory tests and sonographic findings at initial visit in both groups. A total of 99 women were enrolled in our study. 78(78.8%) women were treated conservatively and 21(21.2%) women were needed surgical interventions. In two groups, there are statistically differences in initial pulse rate (p=0.027), hemoglobin (p=0.026), the amount of posterior cul-de-sac fluid (p=0.001), total cul-de-sac fluid (p=0.001), liver dome fluid (p=0.006), estimated fluid amount (p=0.001) at sonographically. In multiple logistic regression analysis, the most important risk factor to make surgical treatment is liver dome fluid collection(OR 1.2 with 95% CI, 1.111-1.202) Sonographic finding such as subhepatic fluid collection is helpful in making decision of treatment in corpus luteal cyst rupture. EP25.05: Table 1. Characteristics and sonographic findings