This paper focuses on the impact of fiscal investment on the labor share and economic growth. A CGE analysis of the relevant data shows: the investment policy made by the government has boosted the economic growth, but the economic growth effects are different between different sectors; a small number of monopolized industries like the petrochemical sector have benefited from the government investment policy far more than the competitive industries; the labor share in the monopolized sectors have been on continous rise and accounted for an increasing portion of the overall national labor share. On the contrary, the proportion of the labor share in the competitive sectors has shown a tendency to decline. This clearly indicates that the large scale government investment has exacerbated the income gap between the monopolized and the competitive sectors. Therefore, the new economic stimulus package of the government should take the negative effects of the policy into serious consideration.