The Company Law stipulates that:

If a listed company purchases or sells major assets within one year or the amount of guarantee exceeds 30% of the company's total assets, it shall make a resolution at the shareholders' meeting, which shall be passed by more than two-thirds of the voting rights held by the shareholders present at the meeting.

Where a company provides a guarantee for the company's shareholders or actual controllers, it must be resolved by the shareholders' meeting or the shareholders' meeting.

Without violating the above two premises, as long as your articles of association say: "The external guarantee of the company is decided by the board of directors", then it can be decided by convening the board of directors.