Formulaic sequences are high-frequency，recurring, continuous or non-continuous multi-word expressions in natural language. They usually have conventional meanings and functions and play an important role in vocabulary acquisition, but they are often neglected because of the low salience. Schmidt (1990) put forward Noticing Hypothesis and considered the noticing of the target language form in language input plays a crucial part in Second Language Acquisition (SLA). Focused tasks in the output will also have an important impact on SLA. This paper explores the effectiveness of text enhancement and focused tasks on the acquisition of English learners’ formulaic sequences from the perspective of input and output theory.