Based on the reported data of aircraft air turbulence in Northeast China and NCEP reanalysis data, the relationship between the Asian-Pacific Oscillation (APO) anomaly in summer and the high-altitude turbulence in Northeast China is discussed by means of correlation analysis, composite analysis and regression analysis, and results show: the high altitude turbulence in Northeast China in summer is strong as a whole, and the maximum area is located in the south of Northeast China, showing a significant consistent increasing trend, with the growth rate exceeding 1.4×10¹⁰a^-1,and significant interannual differences. Asian-Pacific Oscillation (APO) is closely related to the high-altitude turbulence in Northeast China, and its positive anomaly leads to the positive anomaly of the temperature in the middle and upper troposphere in the key area in the south of Northeast China. Due to the thermal wind, the increase of the meridional temperature gradient will lead to the northward position and strong intensity of the subtropical westerly jet. At the same time, the special high-altitude circulation configuration presents a strong geostrophic balance feature, which can stimulate the high-frequency disturbance related to inertial gravity waves, leading to the strengthening of the vertical wind shear of the troposphere zonal wind, which in turn leads to the frequent high-altitude turbulence in Northeast China, and vice versa.