A　tester　for　measuring　face　gears＇　transmission　error　was　developed　based　on　single-flank　rolling　principle.　The　mechanical　host　was　of　hybrid　configuration　of　the　vertical　and　horizontal　structures.　The　tester　is　mainly　constituted　by　base,　precision　spindle,　grating　measurement　system　and　control　unit.　The　structure　of　precision　spindles　was　designed,　and　rotation　accuracy　of　the　spindleswas　improved.　The　key　techniques,　such　as　clamping,　positioning　and　adjustment　of　the　gears　were　researched.　In　order　to　collect　the　data　of　transmission　error,　high-frequency　clock　pulse　subdivision　count　method　with　higher　measurement　resolution　was　proposed.　The　developed　tester　can　inspect　the　following　errors,　such　as　transmission　error　of　the　pair,　tangential　composite　deviation　for　the　measured　face　gear,　pitch　deviation,　eccentricity　error,　and　so　on.　The　results　of　measurement　can　be　analyzed　by　the　tester;　The　tester　can　meet　face　gear　quality　testing　requirements　for　accuracy　of　grade　5.