Using the summative assessment in the teaching has some shortcomings, including the fuzzy testing goal, the monotonous testing content, the loose test process and the cheating in the exam. The importance of formative assessment was analyzed. It is conducive to the comprehensive assessment of students’ abilities and is useful to cultivate students’ innovative consciousness and practical ability. The formative assessment can improve the teaching effect. According to different curriculum characters, the evaluation system of formative assessment was proposed in the paper. For the theory course, the evaluation system includes classroom questions, discussions, notes, working papers, attendance and examination. For the course including practice content, the evaluation system should also include the practice part.