The purpose of this research is to develop ‘criteria for the evaluation of instruction for special education’ for increasing of teaching professionalism by special teacher, and the chief research method adopted is Delphi technique. To attain the study goal, basic questions were devised through literature review, and with the first Delphi research, content validity was verified. Based on the average, standard deviation, CVR(Content Validity ratio), and consistency and convergence values of the questions gained from the first Delphi research result and expert opinions, all the questions were modified. With the corrected questions, the second Delphi research was conducted to examine the importance of the questions and feasibility of the evaluation, and then the questions were revised finally. According to the research result, ‘criteria for the evaluation of instruction for special education’ for students with developmental disabilities can be divided into four areas: ‘knowledge’, 'planning of the unit instruction’, ‘implementation of the unit instruction’, and ‘developing expertise after the instruction’. And the number of questions was total 44 including 5 questions for ‘knowledge’, 12 questions for 'planning of the unit instruction’, and 22 questions for ‘implementation of the unit instruction’, and 5 questions for ‘developing expertise after the instruction’. ‘Criteria for the evaluation of instruction for special education’ for students with developmental disabilities developed by this research can be used by special education teachers as a tool to enhance their instruction expertise or objective criteria supporting reflective thinking for their instruction.