If your 1688 store is sued for product patent infringement, we recommend that you take the following measures:

1. Understand the infringement situation: First, you need to understand the specific situation of the other party's lawsuit, including the infringing product, patent number, infringement time, infringement method, etc.

2. Confirm patent rights: Confirm whether the patent accused by the other party is valid. You can confirm it by checking the official website of the Patent Office or consulting a professional lawyer.

3. Confirm infringement liability: Determine the infringement liability according to the specific situation, including the person responsible, scope of liability, etc.

4. Seek legal assistance: If it is confirmed that there is infringement, you can seek legal assistance, including consulting a lawyer, applying for legal assistance, etc.

5. Negotiate a solution: If the other party proposes a settlement request, you can try to resolve it through negotiation to avoid further losses.

6. Stop infringing behavior: Stop infringing behavior, including stopping sales, stopping manufacturing, etc.

7. Compensation for losses: If infringement is confirmed, you will need to bear the corresponding compensation liability, including economic losses, mental losses, etc.

In short, if your 1688 store is sued for product patent infringement, you need to take timely measures to avoid further losses. It is recommended to consult a professional lawyer for legal assistance.