Abstract: The improvement of college students' Marxism theoretical quality depends on the improvement of teachers' educational ability and students' internal motivation. First, the mobile teaching tool MOSO is used to construct "a teaching community" to improve teachers' Marxism theoretical quality and educational ability so that teachers can play a key role in improving students' Marxism theoretical quality. Second, "a learning community" is established to consolidate students' Marxism theoretical knowledge and improve their Marxism theoretical quality. In addition, a learning resource repository is set up to guide college students to discover the charm of Marxism theory and stimulate their enthusiasm to improve themselves.