For the trademark infringement of West Lake Longjing, the specific situation needs further analysis and understanding. Generally speaking, trademark infringement refers to the unauthorized use of another person's registered trademark, resulting in the infringement of the interests of the trademark owner.

If there is trademark infringement in West Lake Longjing, the trademark owner can take the following measures to safeguard his rights and interests:

1. Issue a warning letter: the trademark owner can issue a warning letter to the infringer to remind him to stop using the infringing trademark, and reserve the right of legal investigation.

2. lodge an administrative complaint: the trademark owner may lodge a complaint with the administrative department for industry and commerce, and demand administrative punishment on the infringing party, such as fines and confiscation of infringing goods.

3. Bring a civil lawsuit: The trademark owner can bring a civil lawsuit to the people's court, asking the infringer to stop the infringement and compensate the economic losses caused by the infringement.

4. Seek arbitration or mediation: The trademark owner can choose to arbitrate or mediate with the infringer and resolve the infringement dispute through consultation.

In a word, trademark infringement is a problem involving legal and intellectual property protection. We should follow the relevant laws and regulations and seek professional legal advice and help.