Using the observation data of Parkes 64 m radio telescope at a central frequency of 1369 MHz,the pulse nulling phenomenon of PSR J1701-3726 was analyzed.It is found that the pulse nulling phenomenon of this pulsar has quasi-periodic,and the quasi-period value approximately is 81.25P,where P is the rotation period,and the pulse nulling ratio NF(Nulling Fraction)is calculated to be 27％±0.97％.Further study on the change of relative energy in the on-pulse region over time shows that there are four different switching modes a,b,c and d between null state and burst state,among which mode a occurs 23 times,mode b occurs 6 times,mode c occurs 5 times,and mode d occurs 79 times,indicating that there may be some randomness in state transitions.
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