Considering　the　characteristics　of　fine　pitch　gears　and　limitations　of　traditional　gear　single-flank　rolling　tester　(GSRT),　a　new　tester　for　fine-pitch　gears　has　been　developed　based　on　a　novel　method　of　GSRT　with　two　driving　motors.　The　key　techniques,　such　as　mounting　and　positioning　of　micro　fine-pitch　gear,　measurement　of　micro　angle　displacement　and　so　on,　were　researched.　The　tester,　with　vertical　configuration,　mainly　consists　of　base,　precision　spindle,　micro　angle　displacement　measurement　unit　and　control　unit.　As　a　new　approach　for　the　inspection　of　fine-pitch　gears,　the　tester　can　inspect　the　transmission　errors　for　fine-pitch　gears.