We evaluated freshwater discharge and suspended sediment(SS) transport into Pacific Ocean from Tohoku and Kanto districts. Measured discharge for class A rivers were collected while discharge for class B rivers was evaluated by using a runoff model (MIKE11). SS transport was calculated using the river discharge obtained here and a sediment rating curve(L=aQb) in which the coefficients were estimated with a new approach presented by the authors.The results indicate that 71 and 29 % of the total freshwater discharge were flowed from the class A and B rivers, resprctively, showing the siginicant sources of the class B rivers for freshwater discharge. 95 % of the total SS transport was on the whole outflowed from the class A rivers, while in the Tohoku district, 18 % of the total SS transport was flowed from the class B rivers.