Abstract: In order to find out the reasons for quality performance difference in different indica/japonica hybrid rice varieties, a field experiment was conducted with 18 early maturing late indica/japonica hybrid rice varieties (lines), among them three representative types of indica/japonica hybrid rice (including Type A: good quality with high yield; Type B: bad quality with high yield; Type C: bad quality and low yield) were screened according to them yield, cooking and eating quality. The variation in the yield and quality of different types of indica/japonica hybrid rice was studied. The average yields of A and B were 22.66% and 22.26% higher than there of C respectively, due to more panicles per unit area and large number of spikelets per panicle of A and B. The rates of brown rice and head milled rice of A were 1.9% to 2.5% and 13.9% to 22.7% higher than those of B and C respectively. Compared with A, the average chalky rate and chalkiness of B and C were 43.3% to 47.5% and 64.5% to 71.4% higher. The average amylose contents were 31.7% and 33% higher in B and C than in A, and the average gel consistency was 4.0% and 4.5% longer in A than in B and C respectively. Type A had the highest peak viscosity, breakdown, and the lowest setback. There was no significant differences in protein content among three types of indica/japonica hybrid rice. The temperature during the grain filling period was negatively correlated with the processing quality, appearance quality, the cooking and eating quality of indica/japonica hybrid rice. Therefore, in addition to genetic factors, through reasonable sowing date or cultivation management regulation, we can get relatively low temperature at grain filling stage of rice, which is conducive to the synchronous improvement in appearance quality and cooking and eating quality.