As an origin of dark energy, an X-particle with repulsive force proportional to energy density has been proposed [1]. In this paper, we will develop the X-particle theory further, and postulate how dark energy could form a ubiquitous gravitational field and inertial reference of frames, and why they might be the reason for the uncertainty principle. Like photon, an X-particle has only relativistic mass, and acts like a particle that has a definite position and momentum. It creates spaces between them by forces of gravitational attraction and repulsion. However, unlike photon that travels in space, an X-particle only needs to pass signals to its neighboring particles to form the ubiquitous gravitational field. This model could explain how gravitational signals propagate at the speed of light, how their values are stored in X-particles, and why the uncertainty principle could arise from this.