[Objective] The development trend and main influencing factors of grain output in Hebei Province was studied in order to provide scientific basis for guaranteeing the grain security of China.[Methods] The trend of grain yield in Hebei Province from 1978 to 2015 was extracted by EMD method. The influencing factors of grain yield in Hebei Province were quantitatively studied by C-D production function and total factor productivity(TFP).[Results] The grain total output of Hebei Province displayed obvious gradualness. In details, it contained rapid increase stage, slow development stage and stagnation or even decline stage, respectively. For the grain yield influencing factors, their rank of contribution was:the planting area(51.99%) > the effective irrigated area(38.68%) > the scientific and technological progress(12.73%) > the agriculture forestry animal husbandry and fishery labor force(-2.86%) > the government expenditure on agricultural production and undertakings(-0.55%).[Conclusion] The main influencing factors to promote the growth of grain output of Hebei Province are the planting area, the effective irrigated area and the scientific and technological progress.