Is Guangzhou social security graded?

According to Guangzhou social security policy, social security is divided into four grades: the lowest grade, the first grade, the second grade and the third grade. The payment base, treatment, welfare and expenses of different grades are different. Take September of 20021year as an example, the minimum monthly payment is 692.37 yuan, the first monthly payment is 692.37 yuan, the second monthly payment is 835.97 yuan, and the third monthly payment is 979.77 yuan.