A method for implementing an online mutual aid question-answer service comprises: a questioning user uploading an edited question to an extensible markup language document management (XDM) server; an answering user subscribing for a question from the XDM server, the XDM server sending the question subscribed for to the answering user; and after the answering user receives the question, the answering user answering the question, and informing the questioning user of the question about an answer of the question.