A new algorithms of digital modulation recognition is presented in this article. Artificial neural networks (ANNs) are used to recognize digital modulation in this approach, which is suitable for digital modulation types including 2ASK, 4ASK, 2FSK, 4FSK, 2PSK, 4PSK. ANNs approach can automatically chose the threshold for each feature. It not only makes the classification intelligible, but also improves the success rate of classification.