Combined with the first phase and the second phase project of 12.5 m deepwater channel of the Yangtze River downstream Nanjing,using the supporting inclined plate geotextiles-laying vessel,the deepwater sinking soft mattre was constructed.In the first phase of the project under the conditions of 35 m water depth and 2 m/s velocity,the construction method of deep water sinking soft mattre was completed.In the two phase of construction under the 46 m water depth conditions,the sinking soft mattre construction was completed.The construction method of waterway regulation reforms the traditional layout construction using hanging floating skateboard laying equipment.The construction efficiency was up to 1 222.2 m2/h,and paving soft mattre longest single row body is 642.6 m.