Based on the remote sensing and surface observations, the actuality of urban heat island and the temperature distribution characteristics of urban land surface in Beijing are obtained. Using urban boundary layer model of Peking University, the study focuses on the impact of “Wedge-shaped greenland” plan on Beijing urban climate in the view of meteorology. This three-dimension urban boundary layer model is developed by using surface temperature calculated by energy balance model as lower boundary condition, and using mesoscale model MM5 as initial condition and lateral boundary conditions. This modeling system is used to investigate detailed structure of urban boundary layer under mesoscale background. Through case simulation, model system can simulate the characteristics of wind and temperature field correctly, and it can be used to do some test for the planning “Wedge-shaped greenland”. And the simulation result shows that this plan can reduce the temperature in and around the greenland, but it can result in the wind velocity reduction and bad ventilation in the downwind of the urban area.

A 40-year time series of annual precipitation and its distribution during the growth period of winter wheat at Luancheng Station, Agro-ecosystem Experimental Station of Chinese Ecological Research Network, CAS, located in typical region of Piedmont region of Taihang Mountains, is analyzed by statistic and Mexican Hat Function wavelet analysis. The result shows that the period in different intervals is not stable, but variable. The annual precipitation variation can be divided into two periods, more than mean precipitation before 1980 and less than mean later, on the 40 years scale. On 10 to 30 years scale, it is richer before 1960s and less after 1997, and more or less between them. Furthermore, periodic variation of 5—7 years is found in shorter time scale. In a whole, from now to 2010, annual precipitation will have still a decreasing tendency, but is will be more than that of mean during the coming five years, possibly. Four times of alternate variation, more than mean precipitation before 1967, less from 1967 to 1983, richer from 1984 to 1994 and less after 1995, are found in the whole growing season of winter wheat.