One of the important elements that make up the story is color and attention to the logical relationships between the events in the story. Ferdowsi's relatively thoughtful attention to this category and the precision in the cause and effect relationships of the fictional events in the Shahnameh is one of the brilliant aspects of the Iranian national epic. . But by looking deeply into some of the Shahnameh stories, including "Rostam and Sohrab", it becomes clear that its plot is unstable and weak in many cases, and many questions remain unanswered in different parts of this story. As an example of Rostam's one-night marriage with Tahmina and keeping it secret from the eyes of the courtiers, Rostam and Tahmina's letters to each other, showing Tahmina three rubies and three gold beads to Sohrab, Homan and Barman's mission to prevent Rostam and Sohrab's identity from being revealed. against each other and Rostam's inability to recognize Sohrab's identity are among the things that Pirang has damaged this magnificent story. According to Ferdowsi's extraordinary accuracy of Pirang in other stories of Shahnameh, the weakness of Pirang in the story of Rostam and Sohrab is due to the successive distortions that have been added to this story over time to add to its attractiveness and charm while including it in a moral framework. Or it is caused by repeated deletions, consciously or unconsciously, which have caused many of the central and fundamental lines of the discussed story to disappear and as a result weaken its plot. including Kawardi, which weakens the plot of the story,