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| Symbol | Definition |
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| Internal force of the primary buffer strut |
| Axial force from the primary strut to foot pad hinge joint |
| Axial force from the primary strut to body hinge joint |
| Vertical force from lunar surface to foot pad |
| Force along the lunar surface from lunar surface to foot pad |
| Height of lander framework |
| Distance from body gravity center to foot pad |
| Primary buffer strut length |
| Lower strut length of primary strut |
| Upper sleeve length on the primary buffer strut |
| Secondary buffer strut length |
| Secondary buffer strut length in the stretching status |
| Lower strut length of secondary strut |
| Upper sleeve length on the secondary buffer strut |
| Distance between trimming rocket engine and body gravity center |
| Elastic mass |
| Inelastic mass |
| Vertical force from the primary buffer strut to foot pad hinge joint |
| Vertical force from the primary buffer strut to body hinge joint |
| Hinge joint between primary strut and foot pad |
| Hinge joint between primary strut and secondary strut |
| Touch point between upper sleeve of primary strut and end of the lower strut |
| Hinge joint between primary strut and body |
| Force on the lander by trimming rocket engine |
| Gravity of lander body |
| Gravity of lander foot pad |
| Lunar surface angle, counterclockwise is positive |
| Body gesture angle, counterclockwise is positive |
| Angle velocity of body gesture, counterclockwise is positive |
| Sinking depth of foot pad |
| Angle between two secondary struts |
| Angle between primary strut and horizontal plane, counterclockwise is positive |
| Angle between secondary strut and horizontal plane, counterclockwise is positive |
| Index 0 | Represents initial value |
| Index | Represents the landing legs or trimming rockets 1 and 2, respectively |
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