Xi' an is a big city in China, and the public security situation is generally safe, but like other big cities, there are also some crimes and public security problems. Therefore, as a foreign student, you need to pay attention to some safety issues, especially at night and in crowded places.

Here are some suggestions for keeping safe in Xi 'an:

1. Stay alert: Stay alert no matter day or night, especially in crowds. Don't expose valuables in public places, such as mobile phones, wallets, cameras, etc.

2. avoid traveling at night: try to avoid traveling at night, especially traveling alone. If you have to go out, you'd better travel with other people, especially in sparsely populated places.

3. Pay attention to traffic safety: The traffic situation in Xi 'an is complicated, with frequent traffic accidents. Therefore, we must obey the traffic rules when traveling, and pay attention to the traffic signals and people flow when crossing the road.

4. Know the local police information: Before going to a new place, know the local police information, especially in areas with high crime rate. You can get relevant information through local police websites, social media and other channels.

5. register for security services: if you need to go to an unfamiliar place, you can consider registering for local security services, such as taxi service or car service. These services are usually secured, which can reduce unnecessary risks.

In a word, being alert, cautious and wise is the key to ensure your safety in Xi 'an. If you can follow these suggestions, I believe you can have a happy and safe college life.