The methods for Huaxia Bank to apply for increasing the credit card limit are as follows:

1. Customer service hotline application:

Cardholders can call Huaxia Bank's 24-hour customer service telephone number 95577 or 4-669-5577, and then follow the voice prompts and go to manual service to apply for increasing the credit card limit.

2. Application for outlets:

Cardholders can bring their ID cards and credit cards to the counter of Huaxia Bank outlets to apply for increasing the credit card limit.

3. Online banking application:

Cardholders can access Huaxia Bank's credit card official website /card/cn/index.shtml. After logging in, they can apply to increase the credit card limit in the personal account interface.