Large eddy simulation was carried out to predict the flow and acoustic near fields of a subsonic jet at Mach number of 0.9. The calculation was validated by available DNS and experimental data. Then the correlations between turbulent fluctuations along the center line and shear layer of the jet and the monitored sound pressure signals were analyzed. Furthermore

attentions were also paid to temperature signals on center line so as to unveil their contribution to sound. Results showed that the correlation coefficient peaks near the end of the potential core

indicating that the turbulence signals here contributed the most to the near-field sound pressure signal

and the flow in this area also had high intermittent and convective velocity. The near field sound pressure was also strongly correlated with the fluctuations of the temperature on the center line. But for the gradient of the temperature

only the radial component was intensely correlated with the sound pressure

while the correlation between axial component of the temperature gradient and the sound signal was relatively weak，indicated that the axial temperature gradient contributed little to the near field sound pressure under the simulated temperature ratio.