The invention discloses a stream processing method, which includes: receiving a first stream processing task including one or more stream processing components, a data input and output relationship of the stream processing component, and an identifier of a stream data source; calculating a computing resource required by each stream processing component; and if the first stream processing task includes a first stream processing component which does not meet a preset constraint condition, duplicating the first stream processing component to obtain at least one second stream processing component, so that the data may be allocated to the first stream processing component and the second stream processing component(s), which reduce a probability that system instability and a data processing fault are caused.