Radioactivity level of ShenZhen was investigated before the 26th world college sports, Investigation content including α and β in water, dose level of γ, Radon concentration in soil, radioactive aerosols and radioactivity nuclide content of soil. The result shows that α and β in water, radioactive aerosols and radioactivity nuclide content of soil are under average level of our country, dose level of γ and radioactivity nuclide content of soil exceed average level o...