Electronic Journal of Differential Equations, Vol. 2021 (2021), No. 79, pp. 1-21. Title: Stochastic Newtonian equations with mean boundary conditions Authors: Ying-Jia Guo (Beihua Univ., Jilin, China) Xiao-Meng Jiang (Beihua Univ., Jilin, China) Abstract: This article concerns stochastic Newtonian equations driven by the white noise with mean boundary conditions. We obtain sufficient conditions of the existence and uniqueness of solutions, and then solutions are adapted to the Brownian filtration. As applications, we show the existence and uniqueness of several stochastic differential equations with mean boundary conditions. Submitted April 2, 2021. Published September 17, 2021. Math Subject Classifications: 60H10, 60J50, 60J65. Key Words: Stochastic Newtonian systems; mean boundary conditions; existence and uniqueness