Based on the sea ice grade, sea ice area and monthly atmospheric circulation index time series, wavelet and cross-wavelet methods are employed to investigate the long- term variation characteristics and climatic mechanism of sea ice in the Bohai Sea and the North Huanghai Sea.

The daily average data derived from NCEP/NCAR reanalysis dataset and the interpolated outgoing long wave radiation(OLR) data provided by the National Oceanic and Atmospheric Administration(NOAA) are used and the cross wavelet and wavelet coherence transform methods are applied in this paper.

Specifically addresses operation process of the method, focusing on cross analysis of customer and product , and identifies the specific service order.

Based on the method of cross spectrum analysis,relations between meteorological factors and immigration adult numbers of the rice leaf folder in Tongzhou City Jiangsu Province have been studied,the result shows that the meteorological factors of January and May determine the immigration adult number and the meteorological factors of July only effect the fluctuation in the number of immigrants.

With cross spectrum analysis mothod,it analyzes the dependent and lagged relation of technical market development with economic growth in China from 1987.