To provide an easily producible coating base paper for the production of a coated paper for web offset printing having excellent effect for suppressing the generation of creases in the drying after printing and provide a method for producing the base paper.

The coating base paper for the production of a coated paper for web offset printing having one or more coating layers on one or both surfaces has a longitudinal/lateral strength ratio of 1.1-1.3. The method for the production of the coating base paper for the coated paper for web offset printing comprises the single use of a J/W ratio controlling means or a combination of the controlling means with a shaking controlling means.