Reliability of a distribution system is a factor that is very influential on the continuity of electrical energy distribution to customers. This study aims to determine the reliability of the distribution system of each feeder at PT. PLN (Persero) Rayon Martapura through the calculation of the SAIFI index, and SAIDI based on monitoring data of power outages that occurred during 2017. The method used in this study is to calculate the value of the SAIFI index, and SAIDI on each feeder at Rayon Martapura then compare it to the SPLN standard No. 68-2 1986, IEEE Std 1366-2003, and the working target standard of Rayon Martapura in 2017. Based on the analysis, it is found that in 2017 the distribution system of Rayon Martapura is categorized reliably because each feeder has a range of SAIFI values, and SAIDI has fulfilled the rayon work target. However, when reviewed from the SPLN standard no. 68-2 1986 then the value of SAIFI, and SAIDI that meet the standards only on CPK 01, while another feeder has not met the standard. In addition, if reviewed from the IEEE standard std 1366-2003 then the value of SAIFI, and SAIDI all feeders on Rayon Martapura not meet the standards.