In this talk, I will introduce how to synthesize and study the artificial 5d iridate thin films by the combo of oxide molecular beam epitaxy (OMBE) and angle-resolved photoemission spectroscopy (ARPES) techniques.We will report in-situ ARPES measurements on the electronic structure of epitaxial pseudocubic-structured SrIrO3 thin films, in which the unique spin-orbit coupling induced semi-metallic properties were comprehensively investigated.Moreover, we successfully synthesized a series of high-quality [(SrIrO3)m/(SrTiO3)]n/SrTiO3(100) superlattices (Fig.1) using OMBE, and realized the metal-insulator transition (MIT) by artificial dimensionality control of the iridates.The mechanism of this MIT was then investigated by both transports and our combined OMBE and ARPES system.