In　this　work,　multiple-beam　colloidal　quantum　dot　lasers　are　achieved　in　a　double　waveguide-grating　(waveguide-grating-waveguide,　W-G-W)　microcavity.　The　grating　is　fabricated　simply　using　interference　lithography,　and　CdSe/CdS/ZnS　colloidal　quantum　dots　(CQDs)　are　spin-coated　as　the　gain　to　form　an　active　waveguide-grating　structure.　The　photoresist　film,　which　is　not　completely　etched　to　the　bottom,　provides　another　waveguide-grating　structure.　In　the　W-G-W　structure,　low-threshold　multiple-beam　laser　output　is　realized　under　optical　pumping　with　emission　peaks　at　664.6　and　645.2　nm.　The　oblique　laser　is　derived　from　a　quasi-propagation　mode.　The　thresholds　of　the　two　laser　modes　are　22.7　and　28.3　mu　J/cm(2),　respectively,　and　both　laser　modes　are　TE0　modes.　In　addition,　the　emission　wavelengths　of　the　two　modes　of　the　designed　distributed　feedback　laser　can　be　flexibly　tuned　by　changing　the　thickness　of　the　CQDs＇　waveguide　layer.　The　presence　of　quasi-propagation　modes　provides　another　method　for　designing　compact　laser　sources,　which　could　help　in　the　design　of　wireless　communication　networks,　hyperspectral　3D　sensing,　and　color　laser　displays.