Chlorophyll and its degraded products are often regarded as the indicative marker of the lake productivity.Since the prodominant algae species of the bloom in Lake Taihu is blue algae, the content of phycocyanobilin in the water can indicate the growing level of blue algae in this lake.In order to investigate the roles of the spring recruitment of the algae on the sediment, the surface mud of the sediment samples were collected from Meiliang Bay, Lake Taihu in April and June, 2003.The content of phycocyanobilin was determined by fluorometry, and the contents of chlorophyll a and chlorophyll b were simultaneously determined by synchronous spetrofluorometry.The changes of the pigment contents on the surface of the sediments were confirmed.It is proved that fluorometry can be applied to the analysis of pigments in the sediments because the analytical method is highly sensitive and the results of this experiment are accurate and credible.The different characters of the recruitment between blue algae and non-blue-algae were discussed when the temperature increased in spring, which is significant and helpful to the further research on the succession and recruitment of algae.