The　charge　transfer　between　semiconductors　and　metals　is　greatly　dependent　on　the　crystal　structure　and　properties　of　the　interface.　It　is　well　known　that　Schottky　junctions　formed　by　depositing　Pd　nanoparticles　on　BiOBr　nanosheets　can　accelerate　the　transfer　and　separation　of　carriers.　However,　the　stability　of　the　crystal　structure　and　the　exposed　crystal　surface　with　high　performance　both　decrease　in　the　process　of　photo-deposition.　In　the　present　work,　Pd/BiOBr　photocatalysts　decorated　with　an　La　dopant　were　fabricated　by　a　two-step　synthesis　with　solvothermal　and　photo-deposition　methods.　Interestingly,　Pd/BiOBr　crystals　could　be　reconstructed　by　doping　with　La　ions,　such　as　the　regrowth　of　facets　with　UV　light　irradiation.　The　instability　of　the　crystal　structure　and　lower　photocatalytic　performance　could　be　reversed　by　doping　with　La　ions.　La-Doping　refined　the　crystal　structure　and　strengthened　the　charge　transfer　and　separation　of　carriers　over　Pd/BiOBr,　exhibiting　enhanced　photocatalytic　activity　toward　the　degradation　of　acid　orange　II　(AO　II).　Moreover,　the　reason　for　the　effects　of　the　La　ions　was　investigated　by　density　functional　theory　calculations.