Authentic Assessment is an assessment process that involves multiple forms of performance measurement reflecting the student's learning achievement, motivation, and attitudes on instructional relevant activities. Senior high school teachers still have problems in using authentic assessment for assessing students' achievement. Therefore, the appropriate model of authentic assessment should be developed based on teachers' needs on authentic assessment. This article aims to find out the teacher needs an authentic assessment to assess the speaking skill of grade X students at senior high schools. This is survey research and data were collected through questionnaires from English teachers. The findings show that (1) the characteristic of authentic assessment need by the teacher-related on curriculum K-13 needed by the teachers are easy to apply in daily life, effective rubric score, communicative and continually (2) types of authentic assessment needed by teachers to assess speaking skills, are role play, oral interview, information gap, story retelling and radio broadcast; (3) the text type of authentic assessment needed by the teacher are monolog text, functional text, transactional text and interpersonal.