The rapid globalization has infused Taiwan education with new expectations of students regarding English proficiency skills. For most EFL students, composing English is a difficult task that requires extra efforts, linguistically and cognitively, to formulate the contents. Some researchers believe a prompt can provide a context where the writers can elicit more complex language and thus facilitate writing. A study was conducted to explore the effects of prompts on college EFL learners’ writing performance and their perception of the help of a prompt. College students of an EFL course were invited to participate in this study and compose two writing pieces each—one with a simple title and the other with a prompt of five sentences. All the participants used the same title and prompt, and after writing both pieces, each participant was asked to complete a short questionnaire on their thoughts about the use of prompt. The results showed that the prompt did not have a significant effect on the writing performance of the participants as a whole. However, the majority of the participants preferred having a prompt when writing, even for the writers worse with a prompt. This study showed that a prompt did not help the writing performance in EFL learners and that although most EFL learners did not believe a prompt would help, the majority of EFL learners preferred having a prompt when writing. The reasons for this discrepancy need to be explored further with a larger study population. A study was conducted to explore the effects of prompts on college EFL learners’ writing performance and their perception of the help of a prompt. The results showed that the prompt did not have a significant effect on the writing performance of the participants as a whole. However, the majority of the participants preferred having a prompt when writing, even for the writers worse with a prompt.