The Sr, Ba, Cu contents of 49 samples in the Lower Palaeozoic carbonate rock strata of Beijing were determined by ICP-MS, the geological response of Sr content and the ratios of Sr/Ba and Sr/Cu to different sedimentary environments was analysed systematically. From coastal sea to deep-sea environment Sr content and the ratios of Sr/Ba increase, they have important indicative function on sedimentary environment. The characters of Sr in different lithologies and sedimentary cycles were also discussed deeply, the effect of diagenesis on the distribution of Sr in carbonate rock cann’t be neglected.