The article aims at evaluating of grammar book designed by the author from some experts. Experts’ appraisals were needed to judge whether Textual Enhancement model designed for teaching grammar at IAIN Bukittinggi was valid or not. In this model, the researcher designed grammar lesson of complex sentences under the model of textual enhancement. She made salient grammar features taught by giving boldfaces and colors in every appearance of complex sentences within the texts in order to draw students’ attention to notice it. The study is mixed methods of quantitative and qualitative. Questionnaire and interview were used to collect data of expert judgments on the model developed (grammar book). There are five experts involved in this research who evaluate the book with impressionistic method which includes language, content and organization. The finding reveals that textual enhancement grammar book is valid and reliable. It can be used after being revised in the aspect of language with some grammar and spelling errors, in the aspect of content to suit with native culture, and organization, to consider the attractive sense. Keywords: expert appraisal; textual enhancement; grammar books; teaching grammar