Abstract: Planning! Readiness! Execution! Assessment ! Planning (PREA loop) is the basic process of military system of systems0 command and control. There are data requirements, computation experiment requirements, deriving assessment requirements, and planning and orders development requirements for PREA loop0s running. Aiming at those requirements, parallel PREA loop is advanced, which combines PREA loop with parallel theory. Parallel PREA loop is composed of four conceptions: Data driving from Physics system of systems (SoS) to Descriptive SoS by observing and assessing; Event driving from Descriptive SoS to Predictive SoS by planning; scheme driving from Predictive SoS to Prescriptive SoS by directing and Readiness; Orders driving from Prescriptive SoS to Physics SoS by executing and supervisory control. Corresponding, four intelligence conceptions are advanced: observing and assessing intelligence, planning intelligence, directing intelligence and supervisory control intelligence.