How many trends do He Jingzhi's poems have in form?

There are two tendencies in the form of He Jingzhi's poems, one is "loyalty to heaven", the other is "stair style" and "convex and concave style". Xintianyou skillfully uses the form of folk songs in northern Shaanxi, absorbs the advantages of special arrangement of foreign poems, inherits the advantages of China folk songs and classical poems in syntax and composition, and casts a new poetic style. Concave-convex body is a creation of the poet on the basis of "stepped body". This kind of convex-concave body is partly convex and partly concave, and the whole poem is in a state of staggered convex and concave, and its connected convex and concave parts can often be arranged in a ladder-like ideological level. This form is adopted in Song of Lei Feng and Song of Bayi. But no matter which form, the poet has made careful transformation and sublation.