This study aims to design a system of teaching materials to improve teacher competence, especially pedagogical competence and professional competence through knowledge management system (KMS). The method used is research and development. System development method using rapid application development (RAD). The study was conducted on MTS teachers in South Tangerang city. KMS can be used as a means of sharing teaching materials between teachers. Where each teacher has a personal account and the teacher can upload and upload learning materials to the website, upload test questions, exam questions, vary the exam questions that will be issued during the exam, and discuss in forums with other teachers. The result of this research is to design and build web teaching material system as learning resource to improve pedagogic competence and professional competence of Mts. SeTangerang Selatan teachers.