The results show that pre-absorbed SAP can increase the slumpof the mixture, but SAP without water absorption and pre-absorbed SAP with the deduction ofinternal curing water from mixing water can reduce the slump. The improvement effects of SAP oncompressive strength of concrete increase gradually with the increase of age. Especially from 28 days,the compressive strength of concrete increases obviously. At later age, the compressive strengthsof SAP concrete under natural curing environment exceed the strength of reference concrete undernatural curing environment and nearly reach the strengths of reference concrete under standardcuring environment. SAP effectively reduces the shrinkage of concrete, improves the concrete’sabilities of carbonation resistance and chloride penetration resistance. The microscopic test resultsshow that SAP can effectively improve the micro structure and make the pore structure refined. WhenSAP is added into concrete, the gel pores and small capillary pores are increased, the size of bigcapillary pores and air pores are reduced.