17 inbred lines of maize (K335, K352, K254, K247, K233, K285, K299, K369, K354, K370, K112, K324, K231, K154, K296, K376, K382) of different origin were tested. The lines came from American, French, German, Hungarian hybrids; and also from single and interlines hybrids of Polish origin. 5 plants of each line were chosen randomly. The following traits were measured: length and thickness of cob, number of grain rows per cob, cob weight, grain weight, number of grains per cob. The results were statistically analyzed. Analysis of variance by cross classification method for two factors was conducted. Cluster analysis of cluster single method based on Euclidian distance was used to estimate the association of lines. The analyzed lines were divided into groups according to their origin.