The correlation and the diameter analysis to the main agronomic characters of the eight weak vernal wheat varieties which were demonstrated on the 2004-2005 national wheat variety exhibition was done, and the results to indicate the agronomic characters and the output relativity are in turn: number of ear in hm2 (0.8034), seed number of each ear (0.5492), weight of a thousand seeds(-0.4146), high(0.3366), ear of long(0.0639) and each ear of spike-let number. The importance of the direct factors to the output are in turn: weight of a thousand seeds (1.5139), each ear of number of seeds (1.0816), ear of number in hm2 (1.0254), high (0.4358), each ear of spike-let number (0.2968) and ear of long (-0.0274). It indicates that the agronomic characters have the obvious restricted relations. The strategy of the high production of the vernal wheat in Henan province and the technology of the high production cultivation are proposed.
