Under the background of normalization of epidemic prevention and control, how to achieve effective cooperation in a remote office is an urgent problem for organizations. Online communication mainly uses text as the medium. Besides expressing meaning, text also contains the emotions of the transmitter, which has an important impact on the communication and cooperation between two parties. This study starts with the Emotions as Social Information theory (EASI theory) and explores the influence mechanism of emotions of texts on individuals' willingness to cooperate. The results of the experimental study (n=203) found that individuals have higher social perception of the sender of positive texts (i.e. perception of their warmth and competence), so they are more willing to cooperate with them. And social perception plays a partial mediating role in text emotion and willingness to cooperate. The results of this paper reveal the internal mechanism of text emotion promoting cooperation willingness in remote cooperation and provide a new perspective on how to improve cooperation willingness.