Panicle length and effective panicle number of rice are closely related to yield.In this experiment,indica V20 B as female parent was crossed with javanica CPSLO17 as male parent,recombinant inbred line( RIL) populations were obtained by single seed descent method,and with the RIL populations as mapping populations,QTL mapping and analysis were performed to the two panicle traits,panicle length and effective panicle.A high-density genetic map was constructed with SLAF labels,interval mapping was performed by software Map QTL5 under the threshold of 3.9,and 7 QTLs were detected on 3 chromosomes in total.Among the 7 QTLs,5 QTLs controlling panicle length( q PL1-1,q PL1-2,q PL6-1,q PL6-2 and q PL6-3) were located on chromosomes 1 and 6,respectively,and showed the contribution rates of 6.41%,22.22%,6.15%,12.24% and 13.01%,respectively,their effect-increasing loci were mainly from CPSLO17,and q PL1-1 is a new QTL; and 2 QTLs controlling effective panicle number( q PN1 and q PN4) were located on chromosomes 1 and 4,respectively,and exhibited the contribution rates of 13.15% and 8.18%,respectively,and the effect-increasing loci were from parent V20 B.The marking of these loci lays a foundation for further cloning of genes controlling panicle length and effective panicle number and molecular marker-assisted selection. Panicle length and effective panicle number of rice are closely related to yield.In this experiment, indica V20 B as female parent was crossed with javanica CPSLO17 as male parent, recombinant inbred line (RIL) populations were obtained by single seed descent method, and with the RIL populations as mapping populations, QTL mapping and analysis were performed on the two panicle traits, panicle length and effective panicle. A high-density genetic map was constructed with SLAF labels, interval mapping was performed by software map QTL5 under the threshold of 3.9 , and 7 QTLs were detected on 3 chromosomes in total. Among the 7 QTLs, 5 QTLs controlling panicle length (q PL1-1, q PL1-2, q PL6-1, q PL6-2 and q PL6-3) were located on chromosomes 1 and 6, respectively, and showed the contribution rates of 6.41%, 22.22%, 6.15%, 12.24% and 13.01%, respectively, their effect-increasing loci were mainly from CPSLO17, and q PL1-1 is a new QTL ; and 2 QTLs controlling effective panicle number (q PN1 and q PN4) were locate d on chromosomes 1 and 4, respectively, and showed the contribution rates of 13.15% and 8.18%, respectively, and the effect-increasing loci were from parent V20 B. The marking of these loci lays a foundation for further cloning of genes controlling panicle length and effective panicle number and molecular marker-assisted selection.