According to the integrated modular avionics (IMA) platform characteristics of robust partitioning, the IMA platform should be capable of providing robust partitioning and other protection for hosted applications and hosted functions, which allows multiple hosted applications to share a platform and its resource and the resource can support systematic distributed functions running on a fault-tolerant network. According to the requirements of robust partitioning, safety and acceptance data of evidence for IMA platform in integrated modular development guidance and certification consideration RTCADO-297 standard, the IMA platform partition analysis is studied in this paper, whose key points include the IMA platform and its general processing module (GPM), ARINC664 switch and remote data concentrator (RDC). The strategy and objective of the partition analysis for each item are provided to confirm the activities required for each task, which can supply sufficient evidence for robust partitioning analysis, potential risks mitigation, safety analysis and the acceptance of the IMA platform and its items.