Most　traditional　AOP　(agent-orient　programming)　approaches　lack　special　consideration　for　CPS　(cooperative　problem　solving).A　kind　of　multi-agent　cooperative　system　based　on　3APL　(An　Abstract　agent　Programming　Language)　is　presented.　This　paper　presents　an　EBNF　(Extended　Backus-Naur　Form)　based　3APL　syntax　for　individual　agent　with　introducing　cooperative　plans　expression.　Refer　to　a　new　kind　of　multi-agent　cooperative　operation　semantics,　which　combines　reasoning　rules,　stack,　configuration,　and　transition　rules.　Additionally,　we　study　the　multi-agent　cooperative　deliberation　cycle　processes　deeply.　Further,　a　cooperative　example　is　analyzing　for　addressing　how　to　generate　and　revise　plans　between　agents.