Grain chalkiness characters of the compact panicle type rice (CPR) was improved using the loose panicle type rice line (EG23) with larger length-width ratio of brown rice. The results showed that the improved CPR line EA6 had higher chalkiness quality of rice grain, but shorter panicle, more grain number and larger grain density compared with its parent Zhejing 20. It implied that it is possible to effectively improve grain chalkiness of CPR through adjusting length-width ratio of grain while keeping the panicle length and the grain density. The results also showed different effects for improving grain chalkiness among differently positioned grain within a panicle. The chalkiness improvement was better in the top and the middle grains than the bottom ones within the panicle. In addition, in four different crossing methods, the counter-backcrossing, Zhejing 20/EG23//Zhejing 20, was the most effective for selecting expected materials. EA6 with the improved comprehensive agronomic characters might be used as a good gene resource of rice for improving grain quality in japonica rice breeding, and might be directly applied to the rice production. The results showed that contradiction between yield and quality in CPR was effectively corresponded, and it may be a new way for breeding new rice varieties with both high grain quality and CPR trait.