To clarify the impact mechanism of Forestry Socialization Services（FSS） on farmers’ Forestry Production Factors Inputs（FPFI）and to provide a scientific basis for improving the government purchases of public service supply systems， this paper uses the endogenous swtiching model to explore the impact of the FSS on the FPFI of farm households with the deepening of the division of labor by 2031 households in 6 provinces （regions） in China. The research found that based on counterfactual assumptions， the FSS significantly increased the farmers’ FPFI， which was 0.0836 higher than that of the group which did not use the service. Conversely， if the farmer did not use the service， their capital input and labor input per mu would drop by 2.2607 and 0.4692. Further analysis suggests that the effect of FSS on FPFI was region-specific. It significantly increased the rural householders’ capital investment per mu and labor input per mu in the Eastern Region while the opposite was true in the Western Region. The relationship between capital and labor input was highly complementary in the current forestry production with the factor substitution elasticities of 0.5210， 0.4570 and 0.5960 for the overall sample， the user group and the nonuser group sample respectively. The services could significantly activate the allocation level of the farmers’ forestry production factor， but choosing a single social service could not achieve the goal of saving funds or labor input in total. To match the requirements of the FSS， farmers often increase the investment in capital and labor per mu. Therefore， the government should further improve the system of the FSS， which meets the actual needs of farmers and ease the difficulties farmers face in forest management.