The paper explores the cognitive psychological model of target language production in simultaneous interpretation when the meaning of source language is transformed into messages of interpretation． According to the principle of simplicity and generalization of a model ，some adjustments are made on Kormos ’( 2006) cognitive psychological blueprint of bilingual speech production to get the current model : The source of messages in conceptualizer is represented as an explicit device—source lan- guage meaning ; the components of formulator are adjusted and thus consist of grammatical encoder and phonological encoder based on Levelt ’s ( 1989) model ; the episodic memory is enlarged as L1 ＆ L2 episodic memory ; the device of L2 declarative rules is enlarged as target language declarative knowledge． Following the principle of incremental processing ，the production in different stages is processed autonomously and in parallel． The model adequately describes the cognitive psychological production process from conceptualizer ，formulator ，to articulator ，and the conversion from meaning code ，speech code ，to physical and sound code．