The　performance　of　the　oxide-confined　surface-relief　(SR)　structure　vertical-cavity　surface-emitting　laser　(VCSEL)　is　simulated　and　analyzed　by　using　the　three-dimensional　finite-difference　time-domain　(FDTD)　method.　The　impacts　of　the　device　structure　parameters　on　the　far-field　characteristics　are　researched.　A　single-fundamental-mode　SR　VCSEL　with　an　oxide-aperture　of　15　mu　m　is　designed　and　produced.　The　single-mode　power　of　the　VCSEL　is　5　mW,　the　threshold　current　is　2.5　mA,　far-field　divergent　angles　range　from　7.8　degrees　to　10.8　degrees　and　the　side-mode　suppression　ratio　is　over　30　dB.　The　optical　and　electrical　properties　of　the　device　are　in　agreement　with　the　results　of　FDTD　simulation,　which　shows　that　the　SR　technology　can　effectively　suppress　the　higher-order-mode　lasing,　and　make　the　SR　VCSEL　work　in　a　single　mode　under　a　larger　oxide　aperture.