In the poster design, the elements of handcuffs are combined with the children’s head silhouette, and the visual principle is explored by using the common and mutual relationship of elements. The work skillfully uses images to form heterosexual isomorphism. Children’s head image and handcuffs are combined to create a concise and interesting effect. The works are intended to prohibit the restriction of children’s personal freedom and trafficking in human beings, otherwise they will be subject to due legal sanctions.