For　the　application　in　multi-color　spectrum　combined　dimming　of　LED　plant　lighting,　a　multi-output　LED　driver　based　on　corresponding　spectral　demanded　by　combining　constant　current　Boost　circuit　unit　with　injection　current　Buck　circuit　unit　is　proposed　in　this　paper.　The　operating　principle　and　operating　process　of　the　proposed　driver,　and　the　relationship　between　the　number　of　LEDs　on　the　lamp(left)　and　the　lamp　(right)　and　the　corresponding　spectrum　voltage　regulation　range　is　analyzed　in　detail.　For　the　application　occasions　of　plant　lighting　dimming　of　the　proposed　driver,　a　weighted　dimming　control　strategy　is　proposed　and　the　principle　of　the　control　strategy　is　analyzed　in　detail,　which　high　efficiency　and　wide　range　dimming　can　be　realized.　At　the　same　time,　the　key　parameters　of　the　power　stage　and　the　control　circuit　of　the　proposed　driver　are　designed.　A　prototype　of　the　proposed　driver　with　3-channel　output　(single-channel　rated　power　7W)　was　built.　The　effectiveness　of　the　proposed　combined　driver　and　weighted　dimming　control　strategy　has　been　verified　by　experimental　results.　©　2023　IEEE.