Aim of the paper is to develop model of autobiographical memory. Conway and Pleydell-Pearce (2000) distinguished two parts of autobiographical memory: autobiographical knowledge base and processes of autobiographical memories construction. This model should be completed with ideas concerning relations between above mentioned parts of autobiographical memory. It is proposed that working memory is responsible for communication between autobiographical knowledge base and autobiographical memories construction. Two models of working memory - those of Baddeley's and Cowan's - were used to demonstrate specificity of information coding and retrieval in autobiographical memory. Crucial point for these two approaches is a problem of usefulness of episodic buffer. This buffer may be distinct element in autobiographical memory system, but it is also possible that its function may be fulfilled by central executive. Empirical studies are required to establish a status of episodic buffer proposed recently by Baddeley.