For the problem that the Beidou-3 system is very easily disturbed, a method with smart antennas is proposed in the article. It uses power inverted adaptive zero algorithm based on uniform straight line array. To adapt to the interference environment of rapid changes, on the basis, a null-pit broadening and deepening robust algorithm is proposed. The algorithm can effectively suppress the interference under high dynamic environment. At the same time，combined with the deep coupling technology of vector tracking, the Beidou-3 satellite navigation system has stronger dynamic performance and anti-interference ability. At last, the simulation result demonstrates the new method is right and available, high engineering application value.