T o construct the ideal type of core germplasm Huang huazhan and its der ivatives, the performances of Huanghuazhan and its pedig ree varieties were investig ated in early and late-cropping seasons o f 2007 in Guang zhou, China ( 113b17c E, 23b8cN) . In early- cropping season, the yield was significantly and positively cor related to spikelet number per panicle ( r= 01 716) and the length of the 2nd top leaf ( r= 0. 825) , and significantly negatively correlated to pr oductive panicle number per plant ( r = - 0. 795) . Every 1 unit increase in the spikelet number factor caused an increase of 3. 17 unit in y ield. In latecropping season, the yield w as significantly and positively cor related to 1000- grain weight ( r = 0. 734) . Eating quality w as significantly and positively correlated to length of flag leaf, leng th of the 2nd top leaf and length of the 3rd top leaf, with cor relation coefficients of 0. 798, 0. 794 and 0. 831, r espectiv ely. Every 1 unit decrease in the flag leaf width facto r had a 2. 06 unit incr ease in yield. Ideal type of the cor e germplasm Huanghuazhan and its der ivatives for early cropping season w as differ ent fr om that for late- cropping season. Emphasis should be paid on selection of the plant type with few er panicles, bigger and longer panicle, and longer functional leaves in early-cropping season and higher 1000- grain weight, long er and nar rower functional leaves in late- cropping season in the br eeding nur sery in Guangzhou, China.