In　this　paper,　the　water　lubrication　swash-plate　axial　water　hydraulic　piston　motor　with　floating　valve　plate　was　developed.　It　is　working　pressure　is　10　MPa,　output　rating　torque　is　12.5　N·m,　and　rating　speed　is　1500　r/min.　The　motor　structure　characteristic　was　introduced,　and　experimental　research　on　the　self-development　comprehensive　test　system　was　done　for　the　water　hydraulic　piston　motor.　The　performance　verification　tests　were　also　made.　The　analysis　was　done　for　motor　displacement,　motor　flow　and　efficiency　et　al.　The　experimental　results　prove　the　structure　design　correctness.