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To measure the $R$ value in an energy scan experiment with $\ee$ collisions,precise calculation of initial state radiation is required in event generators.We present an event generator for this consideration, which incorporatesinitial state radiation effects up to the second order accuracy, and theradiative correction factor is calculated using the totally hadronic Born crosssection. The measured exclusive processes are generated according to theircross sections, while the unknown processes are generated using the LUND AreaLaw model, and its parameters are tuned with data collected at $\sqrt s=3.65$GeV. The optimized values are validated with data in the range $\sqrts=2.2324\sim3.671$ GeV. These optimized parameters are universally valid forevent generation below the $D\bar D$ threshold.

Tuning and validation of hadronic event generator for $R$ value measurements in the tau-charm region