This logical analysis method can improve the sales of store members as follows:

1. The goal is to increase the purchase frequency and purchase amount of members.

2. analyze the factors that affect members' buying behavior, such as product quality, price competitiveness, promotion activities, etc.

3. Make corresponding strategies for each factor: improve product quality, optimize price strategy and design attractive promotion activities.

4. Monitor and evaluate in the implementation process, and adjust the strategy in time to achieve the best effect.

5. Establish a good customer relationship management system, and enhance the stickiness of members through personalized recommendation and exclusive benefits.