The study of development in Thai tourist police professional standards aims to develop performance indicator that important to improve Thai tourist police professional standards and professional standard handbook. This study is done by using Mixed Method Research (Qualitative Research and Quantitative Research) which is divided into 5 steps as given below: 1) Literature review by qualitative research 2) Examine questionnaires for group discussion (Focus Group) by expert using qualitative research 3) Survey based on questionnaires for both ...