Abstract: Some recent major research findings on trends of daily maximum and minim um temperature in global warming and warming experiments in agro-ecosystems are summarized briefly.Investigating the daily mean maximum and minimum temperatures of the Northern Hemisphere landmass, it's found that the rising rate of the minim um temperature is 2—3 times as big as that of the maximum temperature during the period of 1950—1993. It indicates that the daily mean maximum and minim um temperatures rising are asymmetry. The largest increase in temperature occurs in wintertime and springtime, implying that temperature increase is asymmetry in seasons too. Similar trends are observed for the past 52 years (1951—2002) in China.The agro-ecosystems response to temperature increasing in asymmetric trends is introduced in detail. As for the rise of the minimum temperature, almost all researches confirm that the growing season has been extended and the spring crops phenological phases have become earlier than before. The minimum temperature and the maximum temperature have different effects on different crops' phenological calendar and on one crop's different phenological phases. Most of the existing reports about agro-ecosystems response to temperature increase concentrate on crops model simulation and statistic description. And most of the results show that increasing temperature has made the growth period shorter and the ripe date earlier. As for these causes, some studies imply that it could cut down the crops yields.But others consider that increasing minimum temperature will lessen the danger of crop chill injury, and will improve the crops yields. Some studies also suggest that the temperature rising, especially the daily maximum temperature rising has nonlinear effects on corn yields. Thus the roles of minimum temperature and maximum temperature to crops grow and yields are still uncertain. The temperature also plays an important role in controlling the soil CO₂ releases. Most of experiments about temperature rising are conducted in OTC (open-top chamber) or greenhouse, where the maximum temperature is increased much more than the minimum temperature (the minimum temperature are almost unchanged comparing with blank). Therefore, all the OTC and greenhouse experiments are mainly set to simulate the effects of the maximum temperature rising on crops. A recently reported method designed to simulate minimum temperature rising is also reviewed. Minimum temperature rising experiments have been carried out on grassland and forest ecosystems, but the experiments in agro-ecosystems are seldom reported.