According to the mass ratio 16:3:1（cement, fly ash, mineral powder, respectively）and the ration of water and material is 0.5, foam concrete with different content of foam was prepared with ordinary Portland cement and a small amount of fly ash and mineral powder. The uniaxial compression tests for sample were conducted and obtained the failure stress and stress-strain curves of foam concrete with different rate of foam under different curing age. The relationships between compressive strength, elastic modulus and void fraction, the change rules of compressive strength and elastic modulus along the curing time were studied. The main results were shown as following: the compressive strength of foam concrete was greatly influenced by curing age, while the elastic modulus was a little in a certain range. The compressive strength, elastic modulus, yield strain decreases with the increase of void fraction. The strength and elastic modulus are exponential with the void fraction, and the relationships between the strength and the elastic modulus is logarithmic.