This yagya is performed to neutralize the Mangal Dosha in the horoscope. There are many malefic effects of the Mangal Dosha. If the Mars is placed either in the first, fourth, seventh, eighth or twelfth house in ones horoscope than it is considered as Mangal dosha or Kuja dosha. It delayed the marriage and relationship. So after this Mangal Dosh or Kuja Dosha Nivaran Pooja you may get more positive results.