Launch vehicles are vulnerable to multipath fading during the static tests in the tower，which leads to intersymbol interference in the telemetry signals.In this paper，the constant modulus algorithm (CMA) is used to carry out blind equalization research on the pulse code modulation/frequency modulation (PCM/FM) telemetry signals in multipath channels.Theoretical analysis and MATLAB simulation are carried out for the intersymbol interference in the telemetry channels，and a blind equalization function test platform is built to carry out experimental verification.The results show that the CMA has a fast convergence speed and a low bit error rate (BER)，and has good robustness and practicability to the multipath interference.