二者意思不同，用法也不同。

take steps : 采取措施（含有有步驟的做…事）例句：The boss decided to take steps to reduce the production cost .(老板決定采取措施降低生產(chǎn)成本。）Local governments took positive steps to stimulate the housing market.(今年地方政府采取積極措施來(lái)刺激房產(chǎn)市場(chǎng)。take a step : 采取措施 ，走一步，邁出一步Take a step back and there will be a bigger world in front of you.(退一步海闊天空。）