Study of BESIII trigger efficiencies with the 2018 J/ψ data *

Using a dedicated data sample taken in 2018 on the $J/\psi$ peak, we perform detailed study of trigger efficiencies BESIII detector. The are determined from three representative physics processes, namely Bhabha-scattering, dimuon production and generic hadronic events with charged particles. combined efficiency all active triggers approaches $100\%$ most cases uncertainties small enough as not to affect analyses.