Abstract: Hydrogen peroxide (H₂O₂ ) is one reactive oxygen species in the metabolism of plant cell.Although it was considered to be harmful to plant cell, more and more evidences have proved that H₂O₂ is an important signal molecule in plant cell under stresses. This article discussed the H₂O₂ metabolism under low temperature stress, and listed the recent researches of H₂O₂ signal transduction, including interaction effect between H₂O₂ and other signal molecules, such as ethylene and salicylic acid, regulation of gene expression
and root water up take by H₂O₂.

Key words: hydrogen peroxide, low temperature stress, signal transduction, cold resistant