Tensile mechanical behavior of cold rolled Si-Mn steel after TRIP (TRansformation Induced Plasticity) and DP (Dual Phase) treatment were investigated under different strain rates.The dynamic tensile test was carried out using the rotation disk bar-bar tensile impact apparatus.At static tension test condition,the values of total elongation for TRIP steel was approximately 2-3 times higher than DP steel because of TRIP effect;the DP steel showed a higher tensile strength because of 39.6vol% martensite in the matrix.The results of tension test at high strain rate condition were different.For the studied steel,the elongation increased with increasing strain rate due to softening of matrix caused by adiabatic heating;in addition,TRIP steel at low strain rate was always higher than that at high strain rate because progressive strain induced retained austenite was suppressed at high strain rate. Tensile mechanical behavior of cold rolled Si-Mn steel after TRIP (TRphase Induced Plasticity) and DP (Dual Phase) treatment were investigated under different strain rates. The dynamic tensile test was carried out using the rotation disk bar-bar tensile impact apparatus. At static tension test condition, the values ​​of total elongation for TRIP steel was approximately 2-3 times higher than DP steel because of TRIP effect; the DP steel showed a higher tensile strength because of 39.6 vol% martensite in the matrix. test at high strain rate condition were different. For the studied steel, the elongation increased with increasing strain rate due to softening of matrix caused by adiabatic heating; in addition, TRIP steel at low strain rate was always higher than that at at high strain rate because progressive strain was suppressed at high strain rate.