Abstract: Blind recognition of space-time block coding (STBC) is an important issue in the non-cooperative scenario. However, few literatures on blind recognition in multiple input single output system are reported. An efficient algorithm for STBC recognition is proposed when a single antenna is employed at the receiver. The algorithm exploits the discrimination features provided by the empirical cumulative distributions (CDFs) of the received signal. The distance between CDFs employed relies on the two-sample Kolmogrov-Smirnov(K-S) test. The proposed algorithm does not need the estimation of channel, noise statistics and modulation type, but only need fewer samples. The simulation shows that the proposed algorithm performs well, and is robust to modulation and carrier frequency offset, even with non-Gaussian noise.