The paper studied on physiological response of 12 grasses material to low temperature stress and cold resistance evaluation by a method of combining field with laboratory experiment. For the field experiment, 12 grasses material changed on physiological indexes in seasonal cold stress. The other part was laboratory simulation experiment, 12 grasses material were treated with different temperature (0℃, -5℃and -10℃) and duration (12h, 24h and 36h) to study effects of low temperature stress on physiolo...