In this study,the purpose is to excavate the main effect of quantitative trait loci related to head length,head length and body length ratio in mirror carp(Cyprinus carpio L.).A group of F₁ hybrids common carp including 68 individuals was used to construct a linkage map using 535 markers,which were arranged to 50 groups covering 2 244.66 cM genetic distance with an average space of 4.63 cM.MapQTL5.0 software was conducted to detect the quantitative trait loci(QTL)for HL and HBR using interval mapping(IM).Results showed that two QTLs were identified for head length on the linkage groups of LG21(SNP1392-HLJ643),LG42(SNP0562-SNP0109),which explained 14.9% to 32.6% of the total variation of the head length;six QTLs were responsible for head length and body length ratio associated with the linkage groups of LG8(HLJ423),LG15(SNP0002),LG18(HLJ1042-SNP0046),LG21(SNP1392-SNP0818),LG39(HLJ322),LG40(SNP0026),which explained 16.4% to 49.3% of the phenotypic variations.Seven QTLs explaining above 20%,HL-21 and HL-42 were major QTLs associated to the head length of common carp;HBR-8,HBR-15,HBR-21,HBR-39 and HBR-40 were major QTLs associated to the head length and body length ratio.These results indicated that it was highly probable that these QTLs were the main regions of the head length,head length and body length ratio development.SPSS general linear model(GLM)verified another group,and results showed that the HLJ692 was significant correlation for mirror carp head length and body length ratio(P<0.05).