1969 was held in Beijing

When the main background is sino-soviet two countries about boundary problem of vice WaiChangJi negotiations is scheduled for October 20, 1969 was held in Beijing.

Before this, MAO zedong at the eve of nine gave the "prepare war" respectively. Early may, the central working conference held a combat readiness. Late June to July early, held in the "three norths" combat meeting. On August 27th, central makes the establishment of a national civil air defense leading group and provinces, municipalities and autonomous regional people's air defense leadership group decision, since then, carried out the mass of the "deep and dig holes" activity. 9 month convened the army combat readiness work session.

On September 26th, MAO zedong instruction: "military don't slacken". The next day, Lin biao designation: "with rumours of perspective, check everything all, carry out everything". To the sino-soviet border talks on the eve of the CPC central committee, "according to the Soviet union was strategic trends and some intelligence material, doubt as to the Soviet union the negotiations I launched a surprise attack smoke". Therefore, the central government decision through discussion, on October 20 days before must will at Beijing central higher main leaders evacuation was finished.