The 9th Congress of Shanghai Association for Science and Technology(SAST) was held on Nov. 22nd to 23rd, 2011. The first part of the congress was the preparatory meeting. The second part of congress was the formal meeting. In the afternoon of Nov. 22nd the preparatory meeting was held at “International Conference Hall” in Shanghai Science Hall. On this preparatory meeting the agenda of the congress and related documents were agreed unanimously. In the morning of Nov. 23rd the 9th Congress of Shanghai Association for Science and Technology was held at Shanghai Municipal Party School. The leaders of China Association for Science and Technology and Shanghai Municipal Government attended the opening ceremony and made important speech. Nearly one thousand representatives from universities, research institutes, academic societies and enterprises in Shanghai attended this congress. The congress discussed and eventually adopted the following documents: 《The work report of 8th committee of Shanghai Association for Science and Technology》, 《The development plan of Shanghai Association for Science and Technology in the period of twelve five-yean plan》, 《“Detail regulations of constitution of Shanghai Association for Science and Technology” implemented by Shanghai Association for Science and Technology》. Total of 343 members of 9th committee and new leaders of Shanghai Association for Science and Technology were elected by vote. The Academician of the Chinese academy of sciences Mr. CHEN Kaixian was elected to Chairman of 9th committee of Shanghai Association for Science and Technology.