According to data released by the World Bank, global investment in education accounts for an average of about 4.3% of GDP. China's data only covers two years, 1998 and 1999, with an average of less than 2%, far behind the world level. Among the G20 countries, countries with a relatively high proportion of investment in education are Saudi Arabia, Canada, and South Africa. The proportion of education investment in Asian countries such as India, Japan, South Korea, and Indonesia is also lower than the world average. According to figures released by the China Bureau of Statistics, China's education investment has exceeded 4% since 2012, which means that China's education investment has reached the same level as the world. In order to maintain data uniformity, the following data will also use data from the World Bank.

Looking at the proportion of education investment in primary schools, middle schools, and universities, Germany, the United Kingdom, France, and Italy in Europe have a lower proportion of investment in primary school education and a higher proportion of investment in secondary education; Canada and Turkey have a higher proportion of investment in university education. Investment in education accounts for a relatively high proportion of total investment in education. Education investment in Japan, Germany, the United Kingdom, France, Italy, Canada, Russia, and Turkey accounts for a lower proportion of government public investment.

Comparing the data on teacher income and education investment, we can see that the proportion of teacher income in education investment in India, Argentina, Mexico and other countries is relatively high, reaching about 80%. In other high-income countries, the proportion of teacher income in education investment is relatively high, reaching about 80%. Teacher income accounts for more than 60% of education investment. According to China's data (1998 and 1999), teachers' income accounts for less than 50% of education investment, of which university teachers only account for about 40% of education investment. Teacher income here refers to total income, so there are two factors that affect the proportion of teachers, one is the average salary of teachers, and the other is the number of teachers. As far as our general feeling is concerned, the income level of teachers (teaching) is relatively low. With the development of urbanization and industrialization, the lack of educational resources is also one of the main problems facing modern education. The lack of educational resources is more reflected in the uneven distribution of educational resources. This is also the main reason why the pressure to enter higher education has been moved from the pre-college entrance examination to the primary school to junior high school.

Comparing the teacher-student ratios at various stages of education can reveal the allocation of educational resources in each country. The country with the lowest ratio of pre-school students to teachers is actually India, which somewhat subverts people's general understanding. China's preschool education teacher-student ratio is on a downward trend, but it is still higher than the world level, which also reflects the relative lack of preschool education resources. This is also related to the urbanization of a large number of rural people. The ratio of preschool education students to teachers in Canada and South Africa is about 30:1, which shows that preschool education resources are the most scarce. Students who want to immigrate to Canada should pay attention. It is best to enjoy the Canadian government’s investment in education after elementary school.

The ratio of students to teachers in primary education in India and South Africa is about 30:1, which is the highest among G20 countries. This shows that primary school teacher resources are relatively scarce. The ratio of primary school students to teachers in China is less than 20%, which is already lower than the world average and close to the level of high-income countries. Russia is a country with a low ratio of students to teachers at the primary school level. This is partly related to Russia's low population density and also shows that Russia has relatively abundant educational resources at the primary school level.

At the secondary level, India and South Africa still have the highest student-teacher ratio among G20 countries, with India’s student-teacher ratio close to 40:1. China's student-teacher ratio has been in a declining stage since 1998. It is now lower than the world average and close to the level of developed countries in Europe and the United States. In comparison, the ratio of students to teachers in secondary education in high-income countries is lower than in upper-middle-income and lower-middle-income countries.

In the university education stage, the proportion of students and teachers in China, Indonesia and Turkey is in a stage of rapid increase. This shows that the growth rate of college students in these countries is higher than the growth rate of university teachers. An increase in the ratio of students to teachers will generally lead to a decrease in the quality of education. The ratio of students to teachers in countries such as Germany, Japan, and Canada is relatively low at about 10:1, which shows that these countries have relatively rich university education resources and can be used as alternative areas for studying abroad outside the United States

< p>Among the G20 countries, South Korea’s education investment effect is the most outstanding in terms of data. The proportion of primary school, middle school, and university students and teachers in South Korea has been on a downward trend since the 1990s, indicating that the growth rate of teachers is high. on the growth rate of students. The rapid increase in the number of teachers will improve the education level of the entire country and thus better promote economic development. South Korea's economic growth rate has remained at the same level as China, which has a lot to do with South Korea's investment in education.