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As revealed recently by the modeling of the multi-wavelength data of theemission following GW170817/GRB 170817A, there was an off-axis energeticrelativistic outflow component launched by this historic double neutron starmerger event. In this work we use the results of these modeling to examine theenergy extraction process of the central engine. We show that the magneticprocess (i.e., the Blandford-Znajek mechanism) is favored, while the neutrinoprocess usually requires a too massive accretion disk if the duration of thecentral engine activity is comparable to the observed $T_{90}$ of GRB 170817A,unless the timescale of the central engine activity is less than $\sim$ 0.2s.We propose that the GRB observations are helpful to constrain the combinedtidal parameter $\tilde{\Lambda}$, and by adopting the accretion disk massdistribution estimated in BZ mechanism, the $90\%$ credible interval of$\tilde{\Lambda}$ for the progenitor of GW170817 is inferred as $309-954$.

GW170817: The energy extraction process of the off-axis relativistic outflow and the constraint on the equation of state of neutron stars