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Abstract - Education is the process of gaining knowledge, skills and values both as individuals and socially, for the benefit of community life. Science as part of education aside from being a collection of knowledge (a body of knowledge), should also be related to ways of thinking. Students understanding of chemical concepts is very much related to process skills. Lack of student understanding of chemistry is inseparable from learning that is dominated by the delivery of information from the teacher to students, so students tend to memorize and lack students process skills.This Study aims to analyze teaching mataerial development in the form of a Chemistry practicum book use Quided inquiry Practicum for High School Grade XI to Measure Scientific Attitudes and Sains Process skills.Research method using Development Research by Stages Analysis,Design, Development,Implementation and Evaluation (ADDIE).The Search instrument are Questionnaire and objective test.The Feasibility of using Chemistry practium book is analyzed based on the standart data of content,apperance,materials and to Measure Scientific Attitudes and Science Process Skills.Data were obtained by using validation sheets that have been validated by team of expert. The Fisrt step in development is the analysis of teaching materials available in Senior High School Teladan Medan ( SMA Swasta Teladan Medan).The result of using Chemistry Practicum book uisng Quided inquiry method is the correlation of students who use inquiry-based pratikum guides to increase scientific attitudes and science process skills in learning but stiil needs to be revised and Developed