Wide band wireless connection has the following advantages: broad frequency band of working area, less starting expenses, fast service supply, full use of frequency, large system capacity and low cost of operation and maintenance etc. Therefore many kinds of wind band wireless connecting systems are springing up one after another recently such as LMDS, LMCS, MMDS and so on . In this article, it compares and analyses some popular kinds of wireless connecting systems and advantages and disadvantages of them.