Polyacrylamide (PAM), a biodegradable polymer, has been used in irrigating ditch to reduce soil loss for a long time. It can also be used as an aggregate agent to keep the balance of soil and water. The performance of PAM as a soil aggregate agent of silty clay loams was conducted by the wet-sieving method in this study. The effects of PAM on the germinations and growths of Bermuda and Bahia were observed by irrigating seeds of the grasses with various concentrations of PAM solutions. The experiments were conducted in a controlled box with constant temperature and humility. An outdoor experiments was also tested to understand the germination rate of seeds and the development of roots of grasses in ambient condition.