Abstract: The energy absorptions of composite laminates reinforced respectively by glass fiber, carbon fiber, aramid fiber, and UHMWPE fiber (separately named as GFRP, CFRP, AFRP and DFRP), were investigated under the low velocity impact. The load sensibilities on dynamic viscoelasticity of composite fiber bundles of these four kinds of fibers were analyzed by using the EPLEXOR500 dynamic mechanical thermal analyzer under high loads. The impact tests show that the impact energy absorption is close related to the fiber properties and failure modes. The impact energy absorptions of AFRP and DFRP laminates through ductile failures are much higher than those of GFRP, and CFRP laminates through brittle failures. Dynamic mechanical thermal analysis of composite fiber bundles show the load effects as that storage modulus increase and loss tangents decrease with the increasing static load, while the case is just reverse with the increasing dynamic load. In these effects, the organic fibers exhibit more serious load sensibilities and non-linearity than the inorganic fibers. These four laminates show the same sequence DFRP>AFRP>GFRP>CFRP on energy absorption as the load sensibility of storage modulus or the value of loss tangent of composite fiber bundles. This reflectes the correlation of the macroscopic impact performance and viscoelasticity which is close associated with material microstructure.