How many years of primary school in Shanghai

According to official website's inquiry, the Education Bureau of Shanghai Municipal People's Government implements a five-year academic system, and the four-year junior high school system is 5+4, which is different from the traditional compulsory education system of 6+3. The advantages of the five-year primary school system are that primary school graduates cancel the competition for further studies and reduce the academic burden of primary school students; It is also conducive to the faster popularization of primary education.