In this paper, the authors proposed a mobile video QA (Question Answering) system for online annotation and ubiquitous multimedia learning. Under the wireless and mobile environment, learners could interact with the system through natural language questions rather than traditional query-like text retrieval. The handheld device is not as well as traditional keyboard input, while the annotation is quite inefficient and inconvenient. To solve this, the authors designed a simple browsing and clicking model to enable learners annotating and auto-feedback as e-mail to learner's mail box. A pilot study was conducted to evaluate the preliminary experimental results for learning. The experimental results showed that the proposed system effectively engaged learners in multimedia video QA in handheld device where all subjects agreed that the system is positive and useful.