The　effect　of　the　support　level　of　intra-aorta　pump　on　the　aorta　was　studied.　A　cardiovascular-pump　system　model　were　designed　using　the　method　of　lumped　parameter　and　elastic　chamber　theory.　Subsequently,　computer　simulations　based　on　the　model　were　conducted.　Results　demonstrate　that　when　the　intra-aorta　pump　works　in　the　mode　of　constant　speed,　the　mean　values　of　the　aortic　pressure　and　blood　flow　increase　with　increasing　rotational　speed　of　the　pump;　on　the　contrary,　their　pulsatility　decreases　significantly.　When　the　pump　speed　is　up　to　7200　r/min,　the　pulsatility　pressure　and　blood　flow　of　the　aortic　approximates　to　0.　The　low　pulsatile　value　of　aortic　pressure　and　blood　flow　will　generate　an　influence　on　the　structure　and　function　of　aorta.　Therefore,　the　constant　speed　control　strategy　is　not　adoptable　for　the　intra-aorta　pump　in　long-term　support.