To address the problem of optimal configuration of user-side energy storage under the latest tariff policy in the third regulatory cycle, a user side energy storage optimization configuration method considering multiple tariff modes is proposed for general industrial and commercial users with transformer capacity ranging from 100 kVA to 315 kVA and free choice of tariff modes. Firstly, the latest tariff policies analyzed and interpreted are as the basis for subsequent model construction. Secondly, optimization configuration models for energy storage are established under 3 modes：two-part tariff based on demand, two-part tariff based on capacity, and single tariff. The most economical energy storage configuration scheme is selected through the comparison of the three modes. Finally, the effectiveness of the proposed method is analyzed and verified through numerical simulation. The proposed method is also applicable to large industrial users and other general industrial and commercial users, which could be seen as a simplification of the proposed method.