This study compares the frame story structure between Kalilah wa Dimnah and Alf Laylah wa Laylah focusing on the relations between frame stories and insert stories. The two works are consisted of introduction and main stories and conclusion. As for the introduction, it prepares the base of frame structure. And the main stories of Kalilah wa Dimnah, for example the Chapter of Lion and Bull develops its motif by deriving many insert stories and shifts 34 times among different stages of stories. The insert stories intensify the main themes of frame story very logically with the function of persuasion and slander and sighing at own fate. On the other hand, the main stories of Alf Laylah wa Laylah, for example the stories from the first night to the tenth night develop the motifs by deriving many insert stories and shifts 32 times among different stages of stories. The insert stories intensify and stress the main themes of the frame stories by repeating their forms and subjects with the function of moral teachings and pleasures. But the sentences that Shahrazad stops her stories whenever the morning comes and starts again them in the night appear in regular and awake the reader`s attention as well as interrupt the context. The dialogue style being consisted of questions and answers makes constant and harmonious derivation of many insert stories and makes two works have open-ended structure.