Specialized knowledge and informations related to investment are needed because investment is not only profitable but also risky. Previous studies have shown that there are significant differences among individuals in their understanding of such complexity and expertise. Consumers with poor investment knowledge are expected to face many difficulties in coping with social changes. In this study, the respondents were classified into three groups according to investment knowledge level: smart, intermediate, and vulnerable. We compared the demographical characteristics, preferred education type, methods of education, contents of education, and organizational organ of education among the three groups. The data used in the analysis are the raw data of the 2015 Fund Investor Survey, which was investigated by the Korea Financial Investment Association. The data were analyzed by chi-square test, crossover analysis and GLMM analysis. The total number of cases is 2,530, and those who received below-average scores in all three categories (fund investment knowledge, fund product knowledge, and financial knowledge) were classified as those with low investment knowledge. These were 665 individuals, accounting for 26.3% of the total. The results of the analysis are as follows. First, people who are in twenties, thirties and sixties and over, women, low-educated person, contract workers, small self-employed, temporary workers and unemployed persons are likely to be vulnerable to investment knowledge. In addition, People who live in local city, low income, and divorced or widowed persons are more likely to be consumers with low level of investment knowledge. Second, people who are in low risk tolerance are likely to prefer short-term education. Third, with respect to preferred education method, there was a significant difference according to age, risk tolerance and consumer type according to investment knowledge level. In conclude, it would be efficient that investment education in the future customize programs by age, risk tolerance, and consumer type according to investment knowledge level.