The writing purpose of Mulan's poems: people's yearning for a peaceful life.
(1) In feudal society, women had no status. Mulan is a professional woman. She works as a maid to join the army instead of her father. "When a general dies in a hundred battles, a strong man returns in ten years." . What men can do, Mulan can do; Mulan can do what men can't. Hua Mulan's heroic image itself is a ruthless mockery of the traditional concept of discrimination against women in feudal society.
(2) In feudal society, the pursuit of fame and fortune is the dominant traditional thought, which is what many people dream of. However, after ten years of fierce fighting, Mulan returned home in triumph, but refused to accept a reward, and was willing to return to the fields and live the farming life of the working people again, which fully reflected the simple and humble quality of the working people. Hua Mulan's behavior itself is a powerful satire on feudal literati who are keen on fame and fortune.
(3) The theme of Mulan's poems is actually pointed out directly in the poems. That is: women are no less than men, and their talents, wisdom and courage are by no means inferior to men. This is the theme of this poem. If summed up in one sentence, it is: praising the women heroes from the working people.