This paper presets a basic study aiming at providing the guidelines for designing visual effects which can direct a user toward a particular state of emotion. Four visual effect animations corresponding to the quadrants of the 2D arousal-valence affective space were designed based on the existing knowledge on the relationships between human emotion and the parameters, such as color, shape, size, density and motion of visual elements. The influence of the animations on human emotion were partially confirmed through the subject studies based on both questionnaire and physiological data measuring.