Objective: To investigate the effects of cinnamaldehyde on Ca~(2+)concentration change in dorsal root ganglia cells of rats with 0 ℃ cold stress,and mRNA expressions of transient receptor potential cation channel,subfamily A,member 1(TRPA1) and transient receptor potential cation channel,subfamily M,member8(TRPM8). Method: The rat dorsal root ganglion neuron cells were put in 0 ℃ cold stress to detect the activity of cells under the different time length of cold stress by the methylthiazolyldiphenyl-tetrazo...