Abstract Sequence-to-sequence (seq2seq) models have achieved tremendous success in text generation tasks. However, there is no guarantee that they can always generate sentences without grammatical errors. In this paper, we present a preliminary empirical study on whether and how much automatic grammatical error correction can help improve seq2seq text generation. We conduct experiments across various seq2seq text generation tasks including machine translation, formality style transfer, sentence compression and simplifification. Experiments show the state-of-the-art grammatical error correction system can improve the grammaticality of generated text and can bring taskoriented improvements in the tasks where target sentences are in a formal style