Abstract: This research aims to analyze the impact of the nuclear leakage of Japan in March of 2011on two typical areas in north China, Beijing and Qingdao. TSP and PM₁₀ samples were collected with glass fibre filters. The pollution levels of radioactive nuclides in particulates were analyzed with an HpGeγ spectrometer. Both Models-3/CMAQ model and HYSPLIT-4dispersion model were applied to analyze the transmission of radioactive nuclides and their impacts on the two areas of China. Results showed that:no detectable levels of ¹³¹I, ¹³⁴Cs, ¹³⁷Cs, ⁷Be were observed before March 28^th in Beijing. The four isotopes were firstly detected on March 29^th, and then rapidly increased until to the peak value on April 1^st to 3^rd (concentration of ¹³¹I, ¹³⁴Cs, ¹³⁷Cs, ⁷Be in PM₁₀were 1.87×10^-3, 4.60×10^-4, 6.52×10^-4, 8.52×10^-3Bq/m³, respectively). After that, ¹³¹I reduced gradually until to undetectable level after April 7^th due to its 8d halflife, while ¹³⁴Cs and ¹³⁷Cs kept a relatively lower level (<5×10^-5 Bq/m³) during the sampling periods. However, ⁷Be remained a relatively high concentration 4.23×10^-3-9.42×10^-3 Bq/m^3for all sampling periods, which may be due to its high background level both in Beijing and in Qingdao. The concentrations of four radioactive nuclides kept at a lower level, which should not much influence on people according to the monitoring data. Results from both trajectory analysis and model simulations indicated that air masses from Fukushima all moved to northeast or southeast after the leakage events. Thus the radionuclides from the leakage in Japan should arrive in China through the diffusion at high altitudes.