Abstract: Random Matrix Theory (RMT) FPT is an invaluable tool for describing the asymptotic behavior of many systems, and has successfully resolved a number of problems which cannot be resolved through the classical mathematics method. In this paper, aiming at high detection performance and started with sample covariance matrices of communication systems with noise, new RMT-based multi-point cooperative signal detection scheme solve the free equations using free convolution operator, and then obtain the accurate signal power. Theoretical analysis and computer simulation results show new scheme is more precise and can converge quickly. So the new algorithm has better theoretical and application value.