To　date,　it　is　still　a　great　challenge　for　highly　efficient　perovskite　devices　to　realize　the　high　quality　perovskite　films　with　high　purity,　high　coverage　ratio　and　good　crystallization　by　two-step　scalable　solution　method.　In　this　study,　a　series　PbI2　films　with　tunable　micro-architecture　of　PbI2　crystals　are　prepared　via　solution　processable　crystal　engineering.　The　perovskite　film,　prepared　by　optimized　pit　spacing　in　gas　pumped　PbI2　film　at　1000　Pa,　shows　the　highest　film　quality,　including　no　residual　PbI2　phase,　compact　morphology,　and　improved　photoluminescence　intensity.　A　transformation　kinetics　shows　that　the　pit　spacing　strongly　influences　both　the　mass　transfer　and　the　sequential　intercalation　reaction　between　CH3NH3I　and　PbI2　crystals,　which　ultimately　determines　the　full　reaction　state　of　the　perovskite　film.　The　perovskite　solar　cells　assembled　by　the　perovskite　film　show　both　high　power-conversion　efficiency　and　good　reproducibility　of　photovoltaic　performance　due　to　the　restrained　charge　recombination　arising　from　the　high　quality　perovskite　film.　(C)　2017　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.