Currently there are multiple types of mobile handheld devices supporting different data formats, image sizes and network architectures. The above situation results in the barriers of mobile learning promotion, such as cross-device digital content browsing, mobile learning content development and instructional course delivery. To eliminate the difficulties and to popularize mobile learning, a solution..AMPLe (Across Mobile Platform Learning system) has been developed. AMPLe is mainly aiming at 2 objectives: 1). Providing a simple editing and uploading method of digital materials to educators; 2). Delivering digital content to the learners using handheld devices like mobile phones, personal digital assistants (PDA) and tablet PCs simultaneously. In order to evaluate the performance of AMPLe, the wetland crab observation in nature science course of elementary school was integrated into the system.