The purpose of this study was to develop tests of technology knowledge for the certification purpose of junior high school technology teachers. Two tests were developed. One is for the graduated students who intend to find vacancies for teaching practicum. Another is for the intern teachers who are seeking formal teaching positions or for certification. The industrial technology education seniors and the fifth year students of the two industrial technology education departments in Taiwan were selected as the research samples. Each test consists of 71 items among seven categories. The categories include general technology, information, communication, construction, manufacture, transportation, power & energy technologies. The tests were validated by technology educators and test developing experts. The value of re-test reliability of the two tests are .5262 and .77226 with significant difference level of .001. The Cronbach α reliability are .84 & .83 for the beginning and certifying tests.