According　to　the　coupled　wave　equation　of　grating　layer　controlling　light　wave　propagation,　a　sub-wavelength　grating　guided　mode　resonance　filter　was　designed.　By　tuning　the　thickness　of　air　layer,　the　filter　can　tune　the　wavelength　of　75　nm,　and　the　linewidth　is　below　or　the　same　as　1　nm.　The　resonant　wavelength　tunable　filter　is　integrated　with　a　Vertical　Cavity　Surface　Emitting　Laser　(VCSEL)　of　central　wavelength　of　1.55　μm,　creating　a　lasing　wavelength　tunable　VCSEL.　It　is　found　that　the　tuning　range　of　lasing　wavelength　is　identical　to　that　of　resonant　wavelength　tunable　filter,　and　the　wavelength　of　lasing　wavelength　tunable　VCSEL　is　equal　to　that　of　resonant　wavelength　tunable　filter　at　the　same　thickness　of　air　layer.　The　VCSEL　can　choose　both　the　lasing　wavelength　and　the　transverse　mode　of　output.　©　2019,　Science　Press.　All　right　reserved.