Ozone O3 of the surface air layer is one of the frontiers in the environmental science research today. It has very important significance to carry out ambient air monitoring and analysis of O3 for prevention and control of atmospheric pollution. O3 is continuously monitored by using multi-reflected White cell Fourier transform infrared (FTIR) spectroscopy in Zhejiang province in July and December, 2010. The monthly variations and diurnal variations of O3 are analyzed by the O3 concentration data. The high concentration of O3 in July is related with strong radiation and high temperature. The diurnal variation of O3 concentration is markedly high in the afternoon and is generally low in the morning and evening.