The High Intensity Heavy-ion Accelerator Facility (HIAF) will be one of the world’s leading heavy-ion accelerators in the near future that enables to explore the unknown territories in nuclear chart, atomic physics research in experiments and heavy-ion applications. This facility is composed of a fully superconducting linear accelerator iLINAC, a fast-cycling synchrotron BRing, and six experimental terminals. The iLINAC is the injector of the HIAF facility and is designed to be the the highest beam intensity superconducting heavy ion linac, which comprises a continuous wave RFQ, a fully superconducting linac (incorporating thirty quarter-wave resonator cavities and in fifty-five half-wave resonator cavities hosting in seventeen cryostats). This talk will introduce the progress of ilinac and some machine research of the iLINAC and beam injection commissioning for the HIAF ring in details.