High Intensity Electron Positron Accelerator (HIEPA) is one of the possible future collider project post BEPCII/BESIII in China. It would provide unique opportunities for understanding the QCD in the energy region bridging the perturbative and non-perturbative QCD; study the physics with tau lepton and charm quarks; search for new forms of hadron and explore the structure of hadrons; search for new physics beyond the Standard Model at high intensity and precision frontier. The proposed HIEPA covers the center-of-mass energy of 2-7 GeV and has peak luminosity of 0.5~1.0x10^35 cm-2s-1 at 4 GeV and polarized beam for physics at the tau-charm sector. It is also possible to serve as a 3rd/4th generation synchrotron radiation facility (SRF), and has the potential for the study for free electron laser (FEL). The 1st international workshop for HIEPA happened in University of Science and Technology, China (USTC), Heifei China, on Jan. 2015, in which the physics potential on HIEPA have been discussed intensitively, and the design of detector and accelerator have also been discussed. The 2nd international workshop for HIEPA will be held on March. 18-21 2018 at UCAS Yanqihu Campus, Huairou, Beijing, China. The purpose of the three-day workshop is to gather the physics community interested to review progress of HIEPA project, to ascertain the physics topic and discovery potential at the tau-charm energy sector of high intensity frontier, to explore the developing and feasibility of the related key technology and design of the accelerator and the detector. In addition, we will take this opportunity to discuss the possibilities of worldwide cooperation and formation of an international collaboration. The workshop is organized by the Collaborative Innovation Center for Elementary Particles and Interactions (CICPI), USTC and UCAS.