Abatract: With the development of the productivity and the capacity that the second and the third domain can be absorbed and translated,the surplus labor force in country is formed.As thing are,the surplus labor force in country is related to the land scale that the single labor force deals in and the earning of the second and the third domain worker.The land scale that single labor deals in is affected by the level of the productivity development,and it is positive correlation to the earning of the second and the third domain worker,but it is negative correlation to anniversary benefit of the unit land area;the more the area of single person deals in,the less the labor force is required in country,and vice versa.