To　investigate　the　dynamic　characteristics　of　an　automotive　and　develop　a　control　method　for　its　safe　braking,　a　dynamic　model　of　the　car　with　active　suspension　devices　during　its　braking　was　established.　The　dynamic　model　was　with　4　degrees　of　freedom,　that　is,　two　degrees　of　freedom　with　the　car　body　and　others　with　forefront　wheels　and　rear　wheels.　For　the　purpose　of　reliable　use　of　the　control　method　in　most　cases,　a　wavy　road　was　included　in　the　problem.　Considering　random　road　surface,　braking　deceleration　and　traveling　speed　of　the　car　when　braking,　a　fuzzy　control　method　was　used.　Based　on　a　real　car　made　in　China,　computer　simulation　was　adopted　to　investigate　the　dynamic　characteristics　of　the　car　and　the　fuzzy　control　method.　The　results　show　that　under　the　condition　of　an　elaborately　developed　fuzzy　control　method　used　in　the　4　active　suspension　devices,　the　displacement　of　the　mass　center　and　the　turnover　angle　of　the　car　body　are　greatly　reduced　and　about　only　one　half　of　their　original　values　are　remained.