The study aims at indicating determinants for Thai mutual fund growth based on two disciplines. The first discipline is the exploratory of Thai mutual funds via descriptive study or fact finding which indicates Thai mutual funds structure in terms of product concentration and the competitive situation as discussed in the last section. The second discipline is econometric model namely fixed effect model testing whether management fees, administrative fees, and other determinants affect the mutual fund growth. Regression model that controls for asset turnover, size of mutual fund, and expense ratio of the fund other than management fees is used.