Abstract: Abstract: Wheat straw is widely used as a kind of inexpensive, abundant, easily available, and sustainable raw material. At the same time, large amounts of wheat straw have still been burned on farmland in China, and have not been timely and properly applied. The smoke and dust from burning have highly adverse impacts on the environment. Therefore, it is urgent to study the pretreatment technology that is green, environmentally friendly, cost-effective and sustainable. Wheat straw was processed by physical methods, and the obtained raw fibers of wheat straw fiber mulch film were further pretreated by physical methods. In order to explore the influence of pulping process parameters on the pulp properties of the pulped raw fibers wheat straw fiber mulch film and the excellent pulp can be used to produce wheat straw fiber mulch film, the influence law of process parameters on the objective function was studied experimentally in this study. In the experiment, the whole wheat straw was pulverized by a crusher and the raw fibers of wheat straw fiber mulch film were obtained by a self-made straw fibers preparation machine. Taking the soaking water temperature, soaking time, beating time, beating load, and pulp volume as influence factors and the dry tensile index, beating degree and pulp fiber length as response indexes to evaluate the pulp properties. The five-factor and five-level (1/2 type) quadratic regression orthogonal rotation center combination design parameter optimization test method was adopt. The variances were analyzed using Design-Expert V6.0.10, and regression models were established between response indexes and influence factors. The analysis results showed that the beating time and the beating load had a very significant effect on the dry tensile index (P<0.01), and the interaction of various factors has no significant effect on the dry tensile index (P>0.05); the beating time, beating load, and the pulp volume had a very significant effect on the degree of beating (P<0.01), the interaction of soaking water temperature and soaking time had a significant effect on the degree of beating (P<0.05) while the interaction of the soaking water temperature and the pulp volume had a very significant effect on the degree of beating (P<0.01 ); beating time and beating load had a very significant effect on fiber length (P<0.01). The regression model optimization results were the soaking water temperature 63℃, soaking time 2 h, water volume of pulping pool 13.50 L, pulping load 4.57-5.50 kg and pulping time 0.25-0.68 h. Under such an optimized combination conditions, the response indexes of wheat straw fiber mulch film pulp processed as follows: the dry tensile index was greater than 5 Nm/g, the beating degree was less than 50 °SR, and the pulp fiber length was more than 0.9 mm, which indicated that the processed pulp could be used for manufacturing wheat straw fiber mulch film, and the wheat straw fiber mulch film could meet the technical requirements for covering and cultivating crops in wet and dry fields.