Political asylum immigrants apply for spouse immigration.

This process is possible. Only relatives can apply if they have identity. Refugees have different demands.

Time is fast, normal. As usual, asylum seekers are usually in danger and must be dealt with as soon as possible.

Signing in Guangzhou doesn't mean getting a visa, does it? His signature should only be part of completing the application. After signing, if the consulate passes, he will be issued a visa, and then he can go out.

The specific waiting time depends on where he is now. I need details to answer you. It is usually possible from one week to six months.

You can usually get a green card after going abroad. A green card simply means that this person can live in the United States for a long time. The number you said should be the case number and application number. Every accepted application has a number that must be obtained from a lawyer. After arriving in the United States, all green cards will be sent home, and the time required is uncertain. Because the waiting time may be longer and the green card number is often used, the customs staff may copy it for you. But there is no need to worry about this figure.

An ordinary green card can enter and leave the country at any time as long as you return within one year. Because you are applying for political asylum, it is not recommended that you return to China immediately after you get your green card, because you are still a citizen of China, and you will still be "politically persecuted" after you return home. If you go back like this, the consulate will suspect that you may cancel your green card.

If you really want to go back to China, you'd better wait until you have lived for five years to get American citizenship, and then you can go back without political danger.

Yes, your spouse must live with you and will probably be investigated. In the early years, many China people were granted political asylum, but later the consulate didn't believe it. Even if you can get a visa, it is estimated that the review will be stricter in the future, so you should be mentally prepared.

The practical significance of applying for immigration is to apply for permanent residency in the United States. If the application is passed, you will get the right to live in the United States for a long time, that is, get a green card.

Supplementary question: There should be various forms you need to fill in when you submit your application. There are detailed instructions telling you what to do next and how to do it. All the forms you fill in must be signed by yourself to take effect.

I hope this answers your question.