Based on the automorphism on the unit interval, an isomorphism Frank t-norm and its dual s-norm are created, which are applicable to Pythagorean fuzzy environment, and the generalized operational laws with respect to pythagorean fuzzy set(PFS) are defined and some properties of these laws are also investigated. Then, the Pythagorean fuzzy Frank weighted averaging(PFFWA) operator and Pythagorean fuzzy Frank weighted geometric(PFFWG) operator are proposed by using the new operational laws. Some desirable properties of these operators are proved. A new approach to solve the Pythagorean fuzzy multiple attribute decision making problem is developed by using the PFFWA and PFFWG operators. By solving the problem of airline service quality assessment, the proposed method is compared with existing methods. The analysis results demonstrate the feasibility and flexibility of the proposed method, and verify its ability to feedback the attitude of the decision maker.