The main purpose of this study aimed to discus the design of signs in Taiwan theme parks, and to compare the relationship between evaluations of legibility and aesthetic of signs. 12 typical kinds of signs were categorized from signs belonged to 3 largest theme parts in Taiwan. By setting up 3 factors of legibility evaluation and 5 of aesthetic, questionnaire were tested to children and their parents aged 3 to 45 via Likert score method. It was found that the legibility of signs got good score (mean=3.77) especially the signs of ‘Text Guiding’ and ‘unified symbol’, and legibility Factor of ‘communication’ got best score. The aesthetic of signs got lower score than legibility (mean=3.21). signs representing retards and forbiddance were not considered as well aesthetic. Aesthetic factors of ‘graceful forms’ and ‘layout’ got worse score than others. In sum, we concluded that legibility of signs got better scores than aesthetic of signs, but correlation between both was not significant. further more, the evaluation difference between male and female was not significant as well as between parents and children, while the evaluation difference was significant in the factor of learning background (majored in design versus not majored in design). After simplifying evaluation factors, two main shafts, which were legibility-aesthetic and Gestalting-form, were categorized. 12 kinds of signs were also simplified as two categories of difference: image representation versus text explanation and strong legibility versus weak legibility. Designers are able to take these four main shafts of difference as references evaluating designs of environmental signs.