Abstract: The oil, protein, starch contents of high oil corn (HOC) is influenced by environment, to estimate the stability of these components, 100 HOC single hybrids and 200 crosses of normal oil corn (NOC) seed parent pollinated with high oil pollinators (HOP) were used in the experiment. The oil content was measured by Nuclear Magnetic Resonance (NMR), the protein and starch content was measured by Near Infrared Reflectance Spectroscopy (NIRS). The results indicated that location effect was higher than that of year. In different years and locations, the average variation range of oil content for 100 HOC hybrids was 1.00%, the maximum and minimum were 1.91% and 0.17%, respectively. There were some differences in variation range and stability for oil content among hybrids. The average variation was 1.00% for protein content in different environments.The average variation of starch was 0.4% in different years and 1.70% among locations, respectively. The maximum variation of starch content for all hybrids was 5.81%. For out-crossed kernels between NOC and HOP, the average variation of oil content was 1.00%, the maximum and minimum were 1.88% and 0.37%, respectively. The average variation of protein content was 1.78%, the maximum and minimum were 3.37% and 0.61%, respectively. The average variation of starch content was 2.95%, the maximum and minimum was 6.21% and 0.71%, respectively.

Key words: High oil Corn, Quality, Xenia, Stability