I know that we recite bismillah two time in surah namal but i want to know that what is the reason behind reciting second time.
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1Possible duplicate of Do I say "bismillah" in 2nd rakat? – Sassir Nov 26 '18 at 7:55
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Reciting it at the beginning of the surah is not mandatory as there's no consensus that it is part of the qur'an. – Sassir Nov 26 '18 at 7:56
The other Bismillah is part of the narrative of the Surah. Suleman عليه السلام is informed of the Kingdom of Saba (verses 22-26) and he sends a letter to their Queen (verse 28) which reads:
إنه من سليمان وإنه بسم الله الرحمن الرحيم
ألا تعلوا علي وأتوني مسلمين
Indeed, it is from Solomon, and indeed, it reads: 'In the name of Allah, the Entirely Merciful, the Especially Merciful,
Be not haughty with me but come to me in submission [as Muslims].'
Basically the letter begins with Bismillah, and we are repeating the contents of the letter.