The petals of blooming peach flowers can be large and showy，or small with curved edges（nonshowy），while showy and double flower is desirable in terms of breeding ornamental peaches. Since few studies are conducted to detect the molecular markers linking with the non-showy/showy flower trait，that restricts the molecular breeding for this trait in peach. In the present study，by taking use of re-sequencing data generated from 199 peach varieties and 1042687 single-nucleotide polymorphisms（SNPs），we performed the genome-wide association scanning（GWAS）for the non-showy/showy flower trait. Using a general linear model（GLM），we thereby identified seven signals that were associated with the flower trait on Chr. 2 and Chr. 8. Three SNPs on Chr. 8 were validated using kompetitive allele-specific PCR（KASP）genotyping in five F1 populations. The SNP on Chr. 8 at 14484624 bp was highly associated with the targeted trait based on the χ2 test. Based on the correlation of the genotyping and phenotypic results of five F1 populations，the highest accuracy was 93.46% at Chr. 8： 14484624 bp. RNA-seq analysis of different tissues and gene annotation enabled identifying one gene（Prupe.8G118100）that showed tissue-specific expression in flower. Collectively，this work identified one SNP which is highly associated with the non-showy/showy flower trait，and one candidate gene，which could facilitate markerassisted selection for ornamental peaches.