Article 6 of the Opinions of the General Administration of Labor on Several Specific Issues Concerning the Implementation of the Interim Measures for Retirement and Resignation of Workers (1978 July11) stipulates that "workers who are engaged in underground, high altitude, high temperature, particularly heavy physical labor and other jobs harmful to their health, whether they are engaged in this kind of work now or have been engaged in this kind of work,

(a) engaged in high altitude and particularly heavy manual labor for a total of ten years;

(two) engaged in underground and high temperature operations for a total of nine years;

(three) engaged in other harmful operations for eight years.

The above years are the actual working years. However, when calculating the continuous length of service, all the time spent in underground and high temperature work is calculated by three months a year; The time spent in other jobs harmful to health shall be counted as one year and six months each year.

Workers who often work in low-temperature places below zero degrees Celsius and workers who work in alpine plateau areas above 4500 meters above sea level all the year round can refer to workers engaged in underground and high-temperature operations; Workers who live in the 4500-meter high mountain plateau all the year round may refer to those who engage in other jobs harmful to health. ""