For example, the names of *.a.com and a.com’s dns txt records are called _acme-challenge.a.com but their values are different. This is unable to join the txt record, and can not be verified.
Help me
You can create multiple TXT records under a single DNS label.
For example:
$ dig +noall +answer _acme-challenge.plugindev.ga txt
_acme-challenge.plugindev.ga. 598 IN TXT "SLqPIPKURLJYkWvm8Xl1tpJP3WKNMNfYKqC0cCxHAxo"
_acme-challenge.plugindev.ga. 598 IN TXT "7S4ZVbhZ0NU86o1qK0xnEaInqHRy4pB7KZem1nQva2Q"
Every DNS management interface should allow you to achieve this.
As long as at one of the values matches, no problem.
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Hi @zhaosong
you have to create two TXT entries with the same domain name and different values.
PS: Sometimes there is a + - so you have one domain name, with + you can add additional entries.
A good DNS zone manager can add multiple TXT records for the same hostname.
How did you ask us for help exactly? 
Checked your domain, there is a Letsencrypt - certificate with a lot of domain names, created today:
CN=*.httpcn.com
01.03.2019
30.05.2019
expires in 90 days *.httpcn.com, *.m.httpcn.com, m.life.httpcn.com,
m.login.httpcn.com, m.ping.httpcn.com, m.user.httpcn.com - 6 entries
So it looks that you have found a solution.
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