Discussing the residual compressive strength of high-performance concrete（HPC） influenced by fire spraying after fire.The variation of compressive strength of C40 HPC at different temperatures and by using different cooling methods is analyzed.The relationship of residual compressive strength with tolerable temperature of HPC is drafted by ORIGIN 7.5 software.The results show that the residual compressive strength of HPC is in the condition of high temperature could be remarkably decreased by fire spraying.Moreover

the residual compressive strength of HPC cooled by fire spraying would continuously be decreased with the increasing of the damaging temperature of the samples.And

we get the fitting second order polynomials representing the relationship between residual compressive strength of HPC cooled by fire spraying and room temperature with fire temperature.