Genomic imprinting is often associated with allele-specific epigenetic modifications.Although many reports suggested potential roles of DNA methylation and H3K27me3 in regulating genomic imprinting,the contributions of allele-specific active histone modifications to imprinting remain still unclear in plants.Here,we report the identification of 337 high-stringency allele-specific H3K4me3 and H3K36me3 peaks in maize endosperm.Pateally preferred H3K4me3 and H3K36me3 peaks mostly co-localized with patemally expressed genes (PEGs),while endosperm-specific matemally expressed genes (endo-MEGs) were associated with mateally preferred H3K4me3 and H3K36me3 peaks.A unique signature for PEGs was observed,where the active H3K4me4 and H3K36me3 as well as repressive H3K27me3 appeared together.At the gene body of con-PEGs (constitutively expressed PEG),H3K27me3 and H3K36me3 were specifically deposited on hypomethylated mateal alleles and hypermethylated pateal alleles,respectively.Around the transcription start sites of endo-MEGs,DNA methylation and H3K4me3 specifically marked pateal and mateal alleles,respectively.In addition,35 mateally expressed non-coding RNAs exhibited the same allele-specific epigenetic features as endo-MEGs,indicating similar mechanisms for the regulation of imprinted genes and non-coding RNAs.Taken together,our results uncover the complex pattes of mutually exclusive epigenetic modifications deposited at different alleles of imprinted genes that are required for genomic imprinting in maize endosperm.