Along　with　the　popularization　of　the　base　line　attack　strategy,　it　is　difficult　for　the　conventional　location　defense　to　confront　with　it.　A　base　line　defense　strategy　in　robot　soccer　is　proposed　in　this　paper.　By　the　judgment　of　real　time　state　on　the　field　and　the　cooperation　of　robot　soccer,　it　can　effectively　reduce　the　probability　of　goal　in　base　line　attack.　The　experiments　conducted　on　simulation　show　the　validity　of　this　base　line　defense　strategy.