The purpose of this study is to examine preschool teachers' perspectives about children's school readiness. Qualitative and quantitative research methods were used in the study as a mixed method research. Data, in the quantitative aspects of the research, were collected through the use of "School Readiness Form" developed by Boz (2004) and "School Readiness Checklist for 5-6 Age Children" developed by the researchers; from 204 preschool teachers. In the qualitative part of the research, open-ended questions were asked for preschool teacher to determine their opinions about children's school readiness. While findings obtained from quantitative aspect revealed that there is a relationship between the skills that children must have and their school readiness; in the qualitative part of the research participants presented an opinion that academic, social communication skills, maturity, communication with parents and the developmental areas have an effect on children's school readiness. In the study, qualitative and quantitative findings were coincided. Some recommendations are made in terms of findings.