The downhole fluid NMR analysis module is an important part of formation tester measures too large echo data which is constrained by data transmission bandwidth so that it is necessary to complete the inversion of T2 spectrum on the hardware platform. The SVD (singular value decomposition) inversion algorithm can not be completed within the specified time, which is based on DSP as the main processing chip. According to the characteristics of inversion method, solving the inverse matrix of different matrix A in advance and storing the results in the downhole nonvolatile memory chip make DSP operation time be reduced from 10 s to 1.33 s, in the 6.6 s time to complete the inversion algorithm. The results show that the proposed method can effectively shorten the computation time and complete the inversion algorithm within the specified time on the hardware platform of downhole fluid module.