Plant height and ear height of maize（Zea mays L.） inbred lines ‘Mo17’, ‘Huangzao 4’ and the F9 recombinant inbred line（RIL） population derived from the cross between ‘Mo17’ and ‘Huangzao 4’ were investigated in this study.According to the data of the RIL population,descriptive statistics,correlation analysis and frequency distribution graphs for the two plant type characters were performed with SPSS11.5 software.The results showed that the two traits were significantly different between the two parental lines,and continuous variations were found in the RIL population.The results provided the phenotypic data in QTL mapping controlling the two plant type characters.