Classifiers are important characteristics of Chinese. All the noun phrases with numerals or demonstratives must co-occur with classifiers, for example, liang zhang zhuozi 'two CL table' or zhe zhi bi 'this CL pen.' Classifiers vary depending on the nouns. This poses a big challenge for learners of Chinese as second language. The goal of this study is to develop a multimedia classifier learning program based on shape.Thirty CSL learners participated in our study: fifteen in the experimental group and fifteen in the control group. The experimental group used the multimedia program and the control group received the same information as paper assignments introducing the nine shape classifiers including saliently one-dimensional tiao, gen, zhi, saliently two-dimensional zhang, pian, mian, and saliently three-dimensional ge, ke, and li. The semantic bases of classifiers were introduced inductively followed by drills and simulated situation.A pretest and a post test were given before and after the ten-week treatment. There is no significant difference between the two groups in the pretest. The paired-sample t-test within neither experimental and control group indicated significant progress. After analyzing by learners' L1, we found interestingly learners with classifier LI relapsed while learners with nonclassifier L1 improved after using the material.