The purpose of this study was to explore instructional design experiment regarding the different performances and influential factors of reflection and assessment on creating creative and imaginative works. This research adopted the quasi-experimental research method with non-equivalent pretest-posttest designs. The 218 college students as samples were randomly assigned into the experimental groups and control groups. The Questionnaire of Creative Thinking (QCT) and Works Analysis Form (WAF) were conducted as assessments in this research. The conclusions of the findings are as followings: 1. the students’ performances of creating creative and imaginative works were better after receiving the creative instructional design of Lotus Blossom Technique (LBT). 2. more excellent imaginative works can be produced, if the students can be provided with specific creating steps. The college students’ creativity performances can be promoted with offerings of creativity courses and methodology by the qualified college teachers with instructional design.