Methane hydrate is an ice-like crystalized material in which methane gas molecules are trapped within water molecule cages. In nature, methane hydrate is found at almost all continental shelves and contains more than 250,000 trillion cubic feet of methane gas, which makes it a promising future energy resource to replace oil and coal [1]. An in-depth understanding of the mechanical behavior of (methane hydrate-bearing sediments) MHBS during depressurization is essential for continuous and sustainable gas production. At the microscale, the morphology and spatial distribution of gas hydrates in MHBS, also called the pore habit, vary significantly, resulting in different loading conditions of soil particles, and thereby affecting the macroscopic mechanical properties of MHBS [2]. Although there are some existing studies focusing on the effect pore habits using DEM, these models, however, are not well calibrated against experiments to capture the complex hydrate-hydrate, hydrate-sand, and sand-sand interactions. This paper aims to investigate the effect of pore habits on the mechanical behavior of MHBS with a comprehensively calibrated DEM model. In this DEM model of MHBS, sand particles will be generated with realistic shapes from CT images, and methane hydrate will be represented by uncrushable small spheres with diameters one-tenth of sand particles. Different sample preparation methods will be adopted to reproduce the four most common pore habits in MHBS, including pore-filling, grain-coating, contact cementing, and load-bearing. The softening bond model will be used to capture the hydrate-hydrate and hydrate-sand interactions, whose micro-parameters will be carefully calculated against the test results of pure hydrate and MHBS. In addition, the micro-parameters governing the sand-sand interactions will also be calibrated. With the comprehensively calibrated DEM model of MHBS, the effect of pore habits is investigated, focusing on the stiffness, strength, and failure pattern. This study will improve the fundamental understanding of the behavior of MHBS with different pore habits, facilitate the exploitation of hydrate reservoirs, and contribute to the reduction of carbon emission.