MicroRNAs comprise a novel class of endogenous, small (only about 20 to 25 nucleotides), and noncoding RNAs. MicroRNAs, in common, play the similar roles as transcription factors by specifically binding the seed sequence within 3’UTR of target genes, by activating their degradation or inhibiting their translation of the target genes mRNAs or inhibit their translation, which result in variety of cell activities changing at different levels. MicroRNA (miRNA) has emerged as an important regulator of gene expression in plants. 146 miRNAs were identified by bioinformatic analysis and RNA library sequencing.