Output　laser　beam　of　high　power　quantum　well　diode　laser　is　linearly　polarized,　and　Gran-Tayor　prism　can　distinguish　two　laser　beams　in　vertical　polarizing　direction　by　its　characteristic　of　birefringence.　If　the　input　beams　are　in　the　opposite　direction　of　the　Gran-Tayor　prism,　they　will　be　coupled　into　one　beam.　The　experiment　takes　two　600　W　diode　laser　stacks　with　808　nm　centre　wavelength.　The　polarizing　direction　of　one　beam　is　changed　by　a　1/2　wave　plate,　the　other　is　unchanged,　and　they　are　polarization　coupled　by　the　Gran-Tylor　prism.　The　laser　beam　propagates　through　fast-axis　or　slow-axis　collimating　lens,　focusing　lens　(f　=　100　mm)　and　slow-axis　spherical　aberration　correcting　lens.　When　the　working　current　is　130　A,　the　electro　optic　efficiency　is　about　43%.　Measured　with　the　UFF100　laser　beam　diagnostics　meter,　the　focal　spot　is　rectangular,　the　area　is　0.547　mm　×　5.0　mm,　the　fast-axis　beam　parameter　product　is　26.1　mm　·　mrad,　and　the　highest　output　power　is　1　kW.　The　laser　system　works　stably.