Abstract-Teacher's ability is the most important and most direct factor influencing the quality of talents training. Talents determine the implementation of the "Chinese Dream". With the existing situation of teacher's ability not meeting the requirement for training innovative talents, the evaluation index system of mathematical teacher's ability was first formulated based on the demand for mathematics ability in the training mode of innovative talents. Then, an improved method and model of evaluating mathematical teacher's ability were proposed by using the method and theory on combination weighting, an improved comprehensive cloud and similar cloud theory. Finally, a case study shows that the method and model presented in the paper are correct, which may give helpful proposal for improving teacher's ability.