Information on the combining ability of inbred lines is important in the hybrid maize breeding program. One of the method to estimate the combining ability is by using line x tester method. The research was aimed to determine the general combining ability (GCA) and the specific combining ability (SCA) of maize inbreds. The research was conducted at Bajeng Experiment Station in South Sulawesi, from August to November 2016. The genetic materials consisted of 60 pairs of experimental hybrids derived from 30 lines and two testers. The treatments were arranged in randomized complete block design (RCBD) with three replications. The observed traits were plant height, ear height, grain shelling percentage, grain moisture content, ear length, ear diameter, number of rows per ear, number of grain per row, 1,000 grain weight and grain yield. Results showed lines that had positive and significant GCA on grain yield were G682, G686, G695 and G704. The positive and significant SCA on grain yield character was obtained only in one pair of cross i.e. G685 x N79. The tester line of N79 and MR14 did not show the GCA differences on yield character among tested lines.